feat(helm): publish OCI helm charts

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

Author: M0NsTeRRR

.github/workflows/release.yml

@@ -28,3 +28,22 @@ jobs:
         uses: helm/chart-releaser-action@v1.2.0
         env:
           CR_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
+
+      - 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