fix: release workflow, properly discover released tags

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

.github/workflows/releases.yml

@@ -35,10 +35,10 @@ jobs:
               chart=$(basename "$chart_path")
               # 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}
+              # get released tag
+              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
@@ -77,22 +77,32 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
+      - name: Install helm
+        uses: azure/setup-helm@v4
+      - name: Install Oras
+        uses: oras-project/setup-oras@v1
       - name: Install Cosign
         uses: sigstore/cosign-installer@v3
       - name: Downloads artifacts
         uses: actions/download-artifact@v4
         with:
           name: artifacts
           path: .cr-release-packages/
+      - 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
         env:
           COSIGN_YES: true
         run: |
           for chart_path in `find .cr-release-packages -name '*.tgz' -print`; do
-            # push chart to OCI  
-            helm push ${chart_path} oci://ghcr.io/${GITHUB_REPOSITORY@L} |& tee helm-push-output.log
+            # push chart to OCI
             chart_release_file=$(basename "$chart_path")
             chart=${chart_release_file%-*}
+            helm push ${chart_path} oci://ghcr.io/${GITHUB_REPOSITORY@L} |& tee helm-push-output.log
             chart_digest=$(awk -F "[, ]+" '/Digest/{print $NF}' < helm-push-output.log)
             # sign chart
             cosign sign "ghcr.io/${GITHUB_REPOSITORY@L}/${chart}@${chart_digest}"