Setup chart linter as github action

.github/workflows/helm-chart-lint.yml

+name: Lint Helm Charts
+
+on: pull_request
+
+jobs:
+  lint-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Set up chart-testing
+        uses: helm/chart-testing-action@v2.0.1
+
+      - name: Run chart-testing (lint)
+        run: ct lint