CI: add tests & linting for helm charts (#121)

* test helm-chart-testing

* upgrade helm/chart-testing-action -> 2.6.1

* - Resolve comments
- HF: adjust condition and catch changed files

* Add ct.yaml config to lint and install step

* remove blank line

Author: ljubon

.github/workflows/lint-test.yaml

@@ -0,0 +1,46 @@
+name: Lint and Test Charts
+
+on: [pull_request,push]
+
+jobs:
+  lint-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Helm
+        uses: azure/setup-helm@v4
+
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.9'
+          check-latest: true
+
+      - name: Set up chart-testing
+        uses: helm/[email protected]
+
+      - name: Run chart-testing (list-changed)
+        id: list-changed
+        run: |
+          changed_files=$(ct list-changed --config ct.yaml --target-branch ${{ github.event.repository.default_branch }} 2>/dev/null | wc -l | tr -d ' ')
+          echo "Changed files detected: $changed_files"
+          if [ $changed_files -ne 0 ]; then
+            echo "changed=true" >> $GITHUB_OUTPUT
+          else
+            echo "changed=false" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Run chart-testing (lint)
+        if: steps.list-changed.outputs.changed == 'true'
+        run: ct lint --config ct.yaml --target-branch ${{ github.event.repository.default_branch }} --validate-maintainers=false
+
+      - name: Create kind cluster
+        if: steps.list-changed.outputs.changed == 'true'
+        uses: helm/[email protected]
+
+      - name: Run chart-testing (install)
+        if: steps.list-changed.outputs.changed == 'true'
+        run: ct install --config ct.yaml --target-branch ${{ github.event.repository.default_branch }}

ct.yaml

@@ -0,0 +1,2 @@
+chart-dirs:
+  - ./