ci: Expand PR validation flow

Signed-off-by: Bᴇʀɴᴅ Sᴄʜᴏʀɢᴇʀs <me@bjw-s.dev>

.github/workflows/charts-lint.yaml

@@ -0,0 +1,51 @@
+name: "Charts: Lint"
+
+on:
+  workflow_call:
+    inputs:
+      checkoutCommit:
+        required: true
+        type: string
+      modifiedCharts:
+        required: true
+        type: string
+
+jobs:
+  lint:
+    name: Lint successful
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+          ref: ${{ inputs.checkoutCommit }}
+
+      - name: Install Helm
+        uses: azure/setup-helm@v1
+        with:
+          version: v3.6.3
+
+      - uses: actions/setup-python@v2
+        with:
+          python-version: 3.7
+
+      - name: Set up chart-testing
+        uses: helm/chart-testing-action@v2.1.0
+
+      - name: Collect changes
+        id: list-changed
+        run: |
+          EXCLUDED=$(yq eval -o=json '.excluded-charts // []' .github/ct-lint.yaml)
+          CHARTS=$(ct list-changed --config .github/ct-lint.yaml)
+          CHARTS_JSON=$(echo "${CHARTS}" | jq -R -s -c 'split("\n")[:-1]')
+          OUTPUT_JSON=$(echo "{\"excluded\": ${EXCLUDED}, \"all\": ${CHARTS_JSON}}" | jq -c '.all-.excluded')
+          echo ::set-output name=charts::${OUTPUT_JSON}
+          if [[ $(echo ${OUTPUT_JSON} | jq -c '. | length') -gt 0 ]]; then
+            echo "::set-output name=detected::true"
+          fi
+
+      - name: Run chart-testing (lint)
+        id: lint
+        if: steps.list-changed.outputs.detected == 'true'
+        run: ct lint --config .github/ct-lint.yaml

.github/workflows/pr-validate.yaml

@@ -10,13 +10,22 @@ concurrency:
   # cancel-in-progress: true
 
 jobs:
-  pr-get-metadata:
+  pr-metadata:
     uses: k8s-at-home/charts/.github/workflows/pr-get-metadata.yaml@master
 
-  charts-update-readme:
+  charts-readme:
     uses: k8s-at-home/charts/.github/workflows/charts-update-readme.yaml@master
     needs:
-      - pr-get-metadata
+      - pr-metadata
     with:
-      isRenovatePR: ${{ needs.pr-get-metadata.outputs.isRenovatePR }}
+      isRenovatePR: ${{ needs.pr-metadata.outputs.isRenovatePR }}
-      modifiedCharts: ${{ needs.pr-get-metadata.outputs.addedOrModifiedCharts }}
+      modifiedCharts: ${{ needs.pr-metadata.outputs.addedOrModifiedCharts }}
+
+  charts-lint:
+    uses: k8s-at-home/charts/.github/workflows/charts-lint.yaml@master
+    needs:
+      - pr-metadata
+      - charts-readme
+    with:
+      checkoutCommit: ${{ needs.charts-readme.outputs.commitHash }}
+      modifiedCharts: ${{ needs.pr-metadata.outputs.addedOrModifiedCharts }}