chore: add Helm chart release CD

.github/workflows/release-chart.yml

@@ -0,0 +1,25 @@
+on:
+  push:
+    tags:
+      - helm/*
+
+permissions:
+  packages: write
+
+jobs:
+  release_chart:
+    runs-on: ubuntu-22.04
+    steps:
+      - uses: actions/checkout@v4
+      - name: Get version
+        id: get_version
+        run: echo "::set-output name=version::${GITHUB_REF_NAME#helm/}"
+      - name: Push chart to GitHub Container Registry
+        uses: appany/[email protected]
+        with:
+          name: publiccode-crawler
+          repository: ${{ github.repository }}/charts
+          tag: ${{ steps.get_version.outputs.version }}
+          registry: ghcr.io
+          registry_username: ${{ github.actor }}
+          registry_password: ${{ secrets.GITHUB_TOKEN }}