ci: add workflow for publishing helm charts

Signed-off-by: Anish Ramasekar <anish.ramasekar@gmail.com>

.github/workflows/chart.yaml

@@ -0,0 +1,30 @@
+name: publish_helm_chart
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - ".github/workflows/chart.yaml"
+      - "charts/**"
+
+permissions:
+  contents: write
+
+jobs:
+  deploy:
+    runs-on: ubuntu-20.04
+    steps:
+      # pinning to the sha 5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f from https://github.com/actions/checkout/releases/tag/v2.3.4
+      - uses: actions/checkout@ec3a7ce113134d7a93b817d10a8272cb61118579
+        with:
+          submodules: true
+          fetch-depth: 0
+      - name: Publish Helm chart
+        # pinning to the sha f1701eb82e4d4b82016e7965501c8b6d79feaec9 from https://github.com/stefanprodan/helm-gh-pages/releases/tag/v1.4.1
+        uses: stefanprodan/helm-gh-pages@f1701eb82e4d4b82016e7965501c8b6d79feaec9
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          charts_dir: charts
+          target_dir: charts
+          linting: off