feat(github): add Helm OCI support (#2209)

Signed-off-by: Engin Diri <engin.diri@ediri.de>

.github/workflows/publish.yml

@@ -4,6 +4,8 @@ on:
   push:
     branches:
       - main
+    paths:
+      - "charts/**"
 
 permissions:
   contents: read
@@ -12,6 +14,7 @@ jobs:
   publish:
     permissions:
       contents: write  # for helm/chart-releaser-action to push chart release and create a release
+      packages: write  # to push OCI chart package to GitHub Registry
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -60,3 +63,20 @@ jobs:
           config: "./.github/configs/cr.yaml"
         env:
           CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+
+      - name: Login to GHCR
+        uses: docker/login-action@465a07811f14bebb1938fbed4728c6a1ff8901fc # v2.2.0
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Push chart to GHCR
+        run: |
+          shopt -s nullglob
+          for pkg in .cr-release-packages/*.tgz; do
+            if [ -z "${pkg:-}" ]; then
+              break
+            fi
+            helm push "${pkg}" oci://ghcr.io/${{ github.repository }}
+          done