CI: Add reviewdog-k8s (#824)

* 💚 Add kubeval-conflint

Signed-off-by: Rintaro Okamura <rintaro.okamura@gmail.com>

* ✨ add kubelinter

Signed-off-by: Rintaro Okamura <rintaro.okamura@gmail.com>

* 🔧 add some exclude rules

Signed-off-by: Rintaro Okamura <rintaro.okamura@gmail.com>

.github/conflint.yaml

@@ -0,0 +1,5 @@
+kubeval:
+  - files:
+    - k8s/**/*.yaml
+    strict: true
+    ignoreMissingSchemas: true

.github/kubelinter.yaml

@@ -0,0 +1,5 @@
+checks:
+  addAllBuildIn: true
+  exclude:
+    - "unset-cpu-requirements"
+    - "unset-memory-requirements"

.github/workflows/reviewdog-k8s.yml

@@ -0,0 +1,52 @@
+#
+# Copyright (C) 2019-2020 Vdaas.org Vald team ( kpango, rinx, kmrmt )
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+name: "reviewdog - K8s manifests"
+on:
+  pull_request:
+    paths:
+      - "k8s/**"
+
+jobs:
+  kubeval-conflint:
+    name: runner / kubeval-conflint
+    runs-on: ubuntu-latest
+    container: mumoshu/conflint:latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: kubeval-conflint
+        run: |
+          set -vx
+          conflint run -c .github/conflint.yaml -efm "%f:%l:%c: %m" || true
+          conflint run -c .github/conflint.yaml -efm "%f:%l:%c: %m" | reviewdog -efm="%f:%l:%c: %m" -reporter=${REPORTER} -tee
+        env:
+          CONFLINT_LOG: DEBUG
+          REVIEWDOG_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          REPORTER: github-pr-review
+  kubelinter:
+    name: runner / kubelinter
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: setup-kubelinter
+        run: |
+          wget https://github.com/stackrox/kube-linter/releases/download/${KUBELINTER_VERSION}/kube-linter-linux.zip
+          unzip kube-linter-linux.zip
+        env:
+          KUBELINTER_VERSION: 0.1.2
+      - name: kubelinter
+        run: |
+          ./kube-linter lint --config .github/kubelinter.yaml k8s