BC-6559 auto scale scanfile deployment on demand (#51)

ansible/roles/antivirus_check_service/tasks/main.yml

@@ -22,4 +22,13 @@
       kubeconfig: ~/.kube/config 
       namespace: "{{ NAMESPACE }}"
       template: scanfile-deployment.yml.j2
-
+
+
+  - name: scanfile scaled object
+    kubernetes.core.k8s:
+      kubeconfig: ~/.kube/config
+      namespace: "{{ NAMESPACE }}"
+      template: scanfile-scaled-object.yml.j2
+    when:
+      - KEDA_ENABLED is defined and KEDA_ENABLED|bool
+      - SCALED_ANTIVIRUS_SCANFILE_WORKER_ENABLED is defined and SCALED_ANTIVIRUS_SCANFILE_WORKER_ENABLED|bool

ansible/roles/antivirus_check_service/templates/scanfile-scaled-object.yml.j2

@@ -0,0 +1,32 @@
+---
+apiVersion: keda.sh/v1alpha1
+kind: ScaledObject
+metadata:
+  name: scanfile-scaledobject
+  namespace: {{ NAMESPACE }}
+  labels:
+    app: antivirus
+    antivirus: scanfile
+    app.kubernetes.io/part-of: schulcloud-verbund
+    app.kubernetes.io/version: {{ ANTIVIRUS_CHECK_SERVICE_IMAGE_TAG }}
+    app.kubernetes.io/name: scanfile
+    app.kubernetes.io/component: antivirus
+    app.kubernetes.io/managed-by: ansible
+    git.branch: {{ ANTIVIRUS_CHECK_SERVICE_BRANCH_NAME }}
+    git.repo: {{ ANTIVIRUS_CHECK_SERVICE_REPO_NAME }}
+spec:
+  scaleTargetRef:
+    name: api-worker-deployment
+  cooldownPeriod: 1800 #keep action for 15min
+  idleReplicaCount: 0
+  minReplicaCount:  {{ ANTIVIRUS_SCANFILE_MIN_REPLICA_COUNT|default("0", true) }}
+  maxReplicaCount:  {{ ANTIVIRUS_SCANFILE_MAX_REPLICA_COUNT|default("1", true) }}
+  triggers:
+  - type: rabbitmq
+    metadata:
+      protocol: amqp
+      queueName: scan_file
+      mode: QueueLength
+      value: "1"
+    authenticationRef:
+      name: rabbitmq-trigger-auth