Feat: need support cron hpa

Signed-off-by: StevenLeiZhang <zhangleiic@163.com>

examples/cronhpa/cronhpa-sample.yaml

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+apiVersion: core.oam.dev/v1beta1
+kind: Application
+metadata:
+  name: helloworld
+spec:
+  components:
+    - name: helloworld
+      type: webservice
+      properties:
+        cpu: "0.5"
+        exposeType: ClusterIP
+        image: oamdev/hello-world
+        memory: 1024Mi
+        ports:
+          - expose: true
+            port: 80
+            protocol: TCP
+      traits:
+        - type: cronhpa
+          properties:
+            targetAPIVersion: apps/v1
+            targetKind: Deployment
+            excludeDates:
+              - '* * * 15 11 *'
+              - '* * * * * 5'
+            hpaJobs:
+              - name: scale-down
+                runOnce: false
+                schedule: "30 */1 * * * *"
+                targetSize: 1
+              - name: scale-up
+                runOnce: false
+                schedule: "0 */1 * * * *"
+                targetSize: 3
+  policies:
+    - name: apply-once
+      type: apply-once
+      properties:
+        enable: true
+        rules:
+          - strategy:
+              path: ["spec.replicas"]
+            selector:
+              resourceTypes: ["Deployment","StatefulSet"]

experimental/addons/cronhpa/README.md

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+# cronhpa
+
+This addon is built based [kubernetes-cronhpa-controller](https://github.com/AliyunContainerService/kubernetes-cronhpa-controller/)
+
+## install
+```shell
+vela addon enable cronhpa
+```
+
+## usage
+
+This addon exposes one Trait "cronhpa", it provides cron horizontal pod autoscaler controller using crontab like scheme.
+
+### properties  
+
+```shell
+
+# properties
++------------------+---------------------------------------------------------------------------------------------+-----------------------+----------+------------+
+|       NAME       |                                         DESCRIPTION                                         |         TYPE          | REQUIRED |  DEFAULT   |
++------------------+---------------------------------------------------------------------------------------------+-----------------------+----------+------------+
+| targetAPIVersion | Specify the apiVersion of scale target.                                                     | string                | false    | apps/v1    |
+| targetKind       | Specify the kind of scale target.                                                           | string                | false    | Deployment |
+| excludeDates     | Specify the job will skip the execution when the dates is matched. The minimum unit is day. | []string              | false    |            |
+| hpaJobs          | Specify multiple cron hpa jobs.                                                             | [[]hpaJobs](#hpajobs) | true     |            |
++------------------+---------------------------------------------------------------------------------------------+-----------------------+----------+------------+
+
+
+## hpaJobs
++------------+------------------------------------------------------------------------------------------------------+--------+----------+---------+
+|    NAME    |                                             DESCRIPTION                                              |  TYPE  | REQUIRED | DEFAULT |
++------------+------------------------------------------------------------------------------------------------------+--------+----------+---------+
+| name       | Specify the name of hpa job, should be unique in one cronhpa spec.                                   | string | true     |         |
+| schedule   | Specify the cron schedule strategy.                                                                  | string | true     |         |
+| targetSize | Specify the size you desired to scale when the scheduled time arrive.                                | int    | true     |         |
+| runOnce    | Specify if this job need executed repeatly, if runOnce is true then the job will only run and exit   | bool   | false    | false   |
+|            | after the first execution.                                                                           |        |          |         |
++------------+------------------------------------------------------------------------------------------------------+--------+----------+---------+
+```
+
+sample as below:
+```yaml
+
+apiVersion: core.oam.dev/v1beta1
+kind: Application
+metadata:
+  name: helloworld
+spec:
+  components:
+    - name: helloworld
+      type: webservice
+      properties:
+        cpu: "0.5"
+        exposeType: ClusterIP
+        image: oamdev/hello-world
+        memory: 1024Mi
+        ports:
+          - expose: true
+            port: 80
+            protocol: TCP
+      traits:
+        - type: scaler
+          properties:
+            replicas: 1
+        - type: cronhpa
+          properties:
+            targetAPIVersion: apps/v1
+            targetKind: Deployment
+            excludeDates:
+              - '* * * 15 11 *'
+              - '* * * * * 5'
+            hpaJobs:
+              - name: scale-down
+                runOnce: false
+                schedule: "30 */1 * * * *"
+                targetSize: 1
+              - name: scale-up
+                runOnce: false
+                schedule: "0 */1 * * * *"
+                targetSize: 3
+
+```

experimental/addons/cronhpa/definitions/cronhpa.cue

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+cronhpa: {
+	type:  "trait"
+	alias: "cronhpa"
+	annotations: {}
+	attributes: {
+		appliesToWorkloads: [
+			"deployments.apps",
+			"statefulsets.apps",
+		]
+		conflictsWith: []
+		podDisruptive:   false
+		workloadRefPath: ""
+	}
+	description: "kubernetes cron horizontal pod autoscaler trait"
+	labels: {}
+}
+
+template: {
+	outputs: {
+		cronhpa: {
+			apiVersion: "autoscaling.alibabacloud.com/v1beta1"
+			kind:       "CronHorizontalPodAutoscaler"
+			metadata: {
+				labels: "controller-tools.k8s.io": "1.0"
+				name: context.name
+			}
+			spec: {
+				scaleTargetRef: {
+					apiVersion: parameter.targetAPIVersion
+					kind:       parameter.targetKind
+					name:       context.name
+				}
+				if parameter.excludeDates != _|_ {
+					excludeDates: [
+						for d in parameter.excludeDates {
+							d
+						},
+					]
+				}
+				jobs: [
+					for s in parameter.hpaJobs {
+						name:       s.name
+						schedule:   s.schedule
+						targetSize: s.targetSize
+						runOnce:    s.runOnce
+					},
+				]
+			}
+		}
+	}
+	parameter: {
+		// +usage=Specify the apiVersion of scale target
+		targetAPIVersion: *"apps/v1" | string
+		// +usage=Specify the kind of scale target
+		targetKind: *"Deployment" | string
+		// +usage=Specify the job will skip the execution when the dates is matched. The minimum unit is day.
+		excludeDates?: [...string]
+		// +usage=Specify multiple cron hpa jobs
+		hpaJobs: [...{
+			// +usage=Specify the name of hpa job, should be unique in one cronhpa spec
+			name: string
+			// +usage=Specify the cron schedule strategy
+			schedule: string
+			// +usage=Specify the size you desired to scale when the scheduled time arrive
+			targetSize: int
+			// +usage=Specify if this job need executed repeatly, if runOnce is true then the job will only run and exit after the first execution.
+			runOnce: *false | bool
+		}]
+	}
+}

experimental/addons/cronhpa/metadata.yaml

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+description: An cron hpa addon for KubeVela.
+icon: ""
+invisible: false
+name: cronhpa
+tags:
+  - Scaler
+  - AutoScaler
+  - Cron
+version: 1.4.1

experimental/addons/cronhpa/parameter.cue

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+parameter: {
+	// +usage=Specify the image registry of cronhpa controller, eg. "registry.aliyuncs.com/acs"
+	registry: *"registry.aliyuncs.com" | string
+	// +usage=Specify the image repository of cronhpa controller, eg. "kubernetes-cronhpa-controller"
+	repository: *"acs/kubernetes-cronhpa-controller" | string
+	// +usage=Specify the image tag of cronhpa controller, eg. "v1.4.1"
+	imageTag: *"v1.4.1-b8cd52c-aliyun" | string
+	// +usage=Specify the names of imagePullSecret for private image registry, eg. "{a,b,c}"
+	imagePullSecrets?: [...string]
+	// +usage=Specify the imagePullPolicy of the image
+	imagePullPolicy: *"Always" | string
+	// +usage=Specify the replicas.
+	replicas: *1 | int
+	// +usage=Specify the namespace to install
+	namespace: *"vela-system" | string
+	// +usage=Specify the clusters to install
+	clusters?: [...string]
+	// +usage=Specifies the attributes of the resource required
+	resources: {
+		requests: {
+			cpu:    *1 | number
+			memory: *"100Mi" | string
+		}
+		limits: {
+			cpu:    *1 | number
+			memory: *"100Mi" | string
+		}
+	}
+}

experimental/addons/cronhpa/resources/component/cronController.cue

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+package main
+
+cronController: {
+	name: "cron-controller"
+	type: "webservice"
+	properties: {
+		image:           parameter.registry + "/" + parameter.repository + ":" + parameter.imageTag
+		imagePullPolicy: parameter.imagePullPolicy
+		if parameter.imagePullSecrets != _|_ {
+			imagePullSecrets: [ for v in parameter.imagePullSecrets {
+				v
+			},
+			]
+		}
+		env: [
+			{
+				name:  "TZ"
+				value: '"Asia/Shanghai"'
+			},
+		]
+	}
+	traits: [
+		{
+			type: "scaler"
+			properties: {
+				replicas: parameter.replicas
+			}
+		}, {
+			type: "resource"
+			properties: {
+				requests: {
+					cpu:    parameter.resources.requests.cpu
+					memory: parameter.resources.requests.memory
+				}
+				limits: {
+					cpu:    parameter.resources.limits.cpu
+					memory: parameter.resources.limits.memory
+				}
+			}
+		}, {
+			type: "labels"
+			properties: {
+				"app":                     "kubernetes-cronhpa-controller"
+				"controller-tools.k8s.io": '2.0'
+			}
+		}, {
+			type: "service-account"
+			properties: {
+				create: true
+				name:   "kubernetes-cronhpa-controller"
+			}
+		},
+	]
+}