feat: revive helm chart publishing

This partially reverts cfdc53f.

.github/workflows/release_helm_charts.yaml

@@ -0,0 +1,68 @@
+name: "Helm chart を更新・公開する"
+
+on:
+  push:
+    # Only when a helm-chart is updated
+    paths:
+      - ".github/workflows/release_helm_charts.yaml"
+      - "helm-charts/**"
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set up Helm
+        uses: azure/setup-helm@v3
+        with:
+          version: v3.9.0
+
+      - uses: actions/setup-python@v4
+        with:
+          python-version: 3.7
+
+      - name: Set up chart-testing
+        uses: helm/[email protected]
+
+      - name: Run chart-testing (list-changed)
+        id: list-changed
+        run: |
+          changed=$(ct list-changed --target-branch main --chart-dirs helm-charts)
+          if [[ -n "$changed" ]]; then
+            echo "::set-output name=changed::true"
+          fi
+
+      - name: Run chart-testing (lint)
+        if: steps.list-changed.outputs.changed == 'true'
+        run: ct lint --target-branch main --chart-dirs helm-charts
+
+  release:
+    runs-on: ubuntu-latest
+    if: ${{ github.ref == 'refs/heads/main' }}
+    needs: ["lint"]
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Configure Git
+        run: |
+          git config user.name "$GITHUB_ACTOR"
+          git config user.email "[email protected]"
+
+      - name: Install Helm
+        uses: azure/setup-helm@v3
+        with:
+          version: v3.9.0
+
+      - name: Run chart-releaser
+        uses: helm/[email protected]
+        with:
+          charts_dir: helm-charts
+        env:
+          CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"