add oci chart release for robusta (#1954)

* add oci chart release for robusta

* add oci chart release for robusta

Author: DrFaust92

.github/workflows/release.yaml

@@ -123,3 +123,15 @@ jobs:
       - name: Upload helm chart
         run: |
           cd helm && ./upload_chart.sh
+
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Push Helm chart to OCI registry
+        run: |
+          helm package helm/robusta
+          helm push robusta-${{env.RELEASE_VER}}.tgz oci://ghcr.io/${{ github.repository_owner }}/charts