feat(helm): publish OCI helm charts (#1430)

* feat(helm): publish OCI helm charts

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

* fix: remove lowercase setup as discussed in review

* fix: use repository variable

---------

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

.github/workflows/release.yaml

@@ -7,6 +7,10 @@ on:
 
 jobs:
   release:
+    permissions:
+      contents: write # to push chart release and create a release (helm/chart-releaser-action)
+      packages: write # needed for ghcr access
+
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
@@ -39,3 +43,20 @@ jobs:
         env:
           CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
           CR_GENERATE_RELEASE_NOTES: true
+
+      - 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
+            helm push "${pkg}" "oci://ghcr.io/${GITHUB_REPOSITORY}"
+          done