Setup chart lint and tests using Github Action

.github/ct.yaml

@@ -0,0 +1,6 @@
+chart-dirs: .
+charts:
+  - gocd
+helm-extra-args: --timeout 1200s
+check-version-increment: true
+debug: true

.github/workflows/lint-test.yaml

@@ -0,0 +1,31 @@
+name: Lint and Test Charts
+
+on: [push, 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
+        with:
+          command: lint
+          config: .github/ct.yaml
+
+      - name: Create kind cluster
+        uses: helm/kind-action@v1.0.0
+        # Only build a kind cluster if there are chart changes to test.
+        if: steps.lint.outputs.changed == 'true'
+
+      - name: Run chart-testing (install)
+        uses: helm/chart-testing-action@v1.0.0
+        with:
+          command: install
+          config: .github/ct.yaml