chore: fix make helm-package command in release charts workflow

Signed-off-by: Skye Gill <[email protected]>

Author: skyerus

.github/workflows/release-please.yml

@@ -161,7 +161,7 @@ jobs:
         run: git merge ${{ needs.release-please.outputs.release_tag_name }}
 
       - name: Generate helm charts
-        run: make helm-package
+        run: IMG=ghcr.io/open-feature/open-feature-operator:main make helm-package
 
       - name: Commit files
         run: |