.github: Add kube-linter check

.github/workflows/tests.yml

@@ -152,3 +152,23 @@ jobs:
         with:
           name: PR_STATUS
           path: SKIP_CI.txt
+
+  kube-linter:
+    name: "🎀 kube-linter"
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - uses: redhat-actions/oc-installer@v1
+    - name: Process template
+      run: |
+        mkdir processed-templates
+        oc process -f templates/composer.yml \
+          -p IMAGE_TAG=image_tag \
+          --local \
+          -o yaml > processed-templates/composer.yml
+
+    - uses: stackrox/kube-linter-action@v1.0.4
+      with:
+        directory: processed-templates
+        config: templates/.kube-linter-config.yml
+        version: 0.3.0

templates/.kube-linter-config.yml

@@ -0,0 +1,4 @@
+checks:
+  exclude:
+  - "no-read-only-root-fs"
+  - "run-as-non-root"