feat(ci): add helm lint

Author: cyril-corbon

.github/workflows/lint-helm.yml

@@ -0,0 +1,20 @@
+name: "Lint: helm chart"
+on:
+  push:
+    branches:
+      - '**'
+    paths:
+      - 'helm/**'
+  workflow_dispatch:
+
+jobs:
+  helm3-lint-test:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Run chart linting
+        uses: helm/[email protected]
+        with:
+          command: lint