Add lint GH action (#2686)

.github/workflows/lint-test.yaml

@@ -0,0 +1,19 @@
+name: Lint and Test Charts
+
+on: pull_request
+
+jobs:
+  lint-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Fetch history
+        run: git fetch --prune --unshallow
+
+      - name: Run chart-testing (lint)
+        id: lint
+        uses: helm/chart-testing-action@v1.0.0-rc.2
+        with:
+          command: lint

ct.yaml

@@ -0,0 +1,7 @@
+chart-dirs:
+  - bitnami
+remote: origin
+validate-chart-schema: true
+validate-maintainers: true
+validate-yaml: true
+check-version-increment: true