.github: setup a CI job to verify helm chart on pull request

.github/workflows/lint.yaml

@@ -0,0 +1,60 @@
+name: Lint Helm Charts
+on:
+  pull_request:
+
+jobs:
+  lint-charts:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Helm
+        uses: azure/setup-helm@v4
+        with:
+          version: 'latest'
+
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.x'
+
+      - name: Set up chart-testing
+        uses: helm/chart-testing-action@v2
+
+      - name: Run chart-testing (list-changed)
+        id: list-changed
+        run: |
+          changed=$(ct list-changed --target-branch ${{ github.event.repository.default_branch }} --chart-dirs charts)
+          if [[ -n "$changed" ]]; then
+            echo "changed=true" >> $GITHUB_OUTPUT
+          fi
+
+      - name: Create kind cluster
+        if: steps.list-changed.outputs.changed == 'true'
+        uses: helm/kind-action@v1.12.0
+
+      - name: Add Helm repositories
+        if: steps.list-changed.outputs.changed == 'true'
+        run: |
+          find charts -name "requirements.yaml" -exec grep 'repository: https://' {} + | awk '{print $2}' | sort -u | while read -r repo; do
+            repo_name=$(echo "$repo" | sed -e 's,https://,,; s,http://,,; s,/.*,,; s,\..*,,')
+            helm repo add "$repo_name" "$repo"
+          done
+
+      - name: Build Helm dependencies
+        if: steps.list-changed.outputs.changed == 'true'
+        run: |
+          for chart in $(ct list-changed --target-branch ${{ github.event.repository.default_branch }} --chart-dirs charts); do
+            helm dependency build "$chart"
+          done
+
+      - name: Run chart-testing (lint)
+        if: steps.list-changed.outputs.changed == 'true'
+        run: |
+          ct lint-and-install \
+             --check-version-increment=true \
+             --target-branch ${{ github.event.repository.default_branch }} \
+             --chart-dirs charts

charts/buildbuddy/Chart.yaml

@@ -1,7 +1,7 @@
 apiVersion: v1
 description: BuildBuddy Open Source
 name: buildbuddy
-version: 0.0.328 # Chart version
+version: 0.0.329 # Chart version
 appVersion: 2.180.0 # Version of deployed app
 keywords:
   - buildbuddy

charts/buildbuddy/values.yaml

@@ -1,3 +1,4 @@
+# This is a test comment to trigger CI.
 ## Default values for BuildBuddy.
 ## This is a YAML-formatted file.
 ## Declare variables to be passed into your templates.