feat: push helm charts in OCI format to ghcr.io (#134)

Signed-off-by: Ludovic Ortega <ludovic.ortega@adminafk.fr>

.github/workflows/releases.yml

@@ -7,6 +7,8 @@ jobs:
   release:
     permissions:
       contents: write
+      packages: write
+      id-token: write
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -17,9 +19,31 @@ jobs:
         run: |
           git config user.name "$GITHUB_ACTOR"
           git config user.email "$GITHUB_ACTOR@users.noreply.github.com"
+
+      # Release tgz to github page
       - name: Run chart-releaser
         uses: helm/chart-releaser-action@v1.6.0
         with:
           config: "./cr.yaml"
         env:
           CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+
+      # Release to OCI registry
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Push charts to GHCR
+        run: |
+          shopt -s nullglob
+          for pkg in .cr-release-packages/*; do
+            if [ -z "${pkg:-}" ]; then
+              break
+            fi
+            lowercase=$(echo "${GITHUB_REPOSITORY}" | tr '[:upper:]' '[:lower:]')
+            echo "Pushing package - ${pkg} to ghcr.io repository - ${lowercase}"
+            helm push "${pkg}" "oci://ghcr.io/${lowercase}"
+          done