github: add helm release workflow

.chart_releaser.yml

@@ -0,0 +1,4 @@
+release-name-template: "helm-{{ .Name }}-{{ .Version }}"
+charts-dir: charts
+charts-repo-url: https://backmarket-oss.github.io/raccoon
+owner: backmarket-oss

.github/workflows/helm-release.yml

@@ -0,0 +1,31 @@
+name: Release Charts
+
+on:
+  push: {}
+
+jobs:
+  release:
+    permissions:
+      contents: write
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
+
+      - name: Configure Git
+        run: |
+          git config user.name "$GITHUB_ACTOR"
+          git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
+
+      - name: Install Helm
+        uses: azure/setup-helm@v3
+
+      - name: Run chart-releaser
+        uses: helm/chart-releaser-action@v1.5.0
+        with:
+          config: .chart_releaser.yml
+        env:
+          CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+