fix: release workflow, properly discover released tags

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

.github/workflows/releases.yml

@@ -36,9 +36,9 @@ jobs:
               # get current version
               current_version=$(grep '^version:' "$chart_path/Chart.yaml" | awk '{print $2}')
               # get current release version
-              oras discover ghcr.io/${GITHUB_REPOSITORY@L}/${chart}:${current_version}
+              released_tags=$(oras repo tags ghcr.io/${GITHUB_REPOSITORY@L}/${chart})
 
-              if [ $? -ne 0 ]; then
+              if ! echo "$released_tags" | grep -qE "^${current_version}$"; then
                 helm dependency build "$chart_path"
                 helm package "$chart_path" --destination ./.cr-release-packages
               else
@@ -89,7 +89,7 @@ jobs:
           COSIGN_YES: true
         run: |
           for chart_path in `find .cr-release-packages -name '*.tgz' -print`; do
-            # push chart to OCI  
+            # push chart to OCI
             helm push ${chart_path} oci://ghcr.io/${GITHUB_REPOSITORY@L} |& tee helm-push-output.log
             chart_release_file=$(basename "$chart_path")
             chart=${chart_release_file%-*}