ci: workflow for releasing helm chart

.github/workflows/helm.yaml

@@ -0,0 +1,37 @@
+name: helm release
+on:
+  workflow_run:
+    workflows: ["release"]
+    types:
+      - completed
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0
+
+      - name: Checkout helm chart repo
+        uses: actions/checkout@v2
+        with:
+          repository: exposr/helm-charts
+          path: helm-charts
+          token: ${{ secrets.HELM_CHART_REPO_TOKEN }}
+
+      - name: Copy source chart
+        run: |
+          rm -fr helm-charts/charts/exposr
+          cp -rp helm helm-charts/charts/exposr
+
+      - name: Publish chart
+        run: |
+          cd helm-charts
+          git config user.name "$GITHUB_ACTOR"
+          git config user.email "[email protected]"
+          git add .
+          git commit -m 'chore: update exposr chart'
+          git push