Change compression format to zstd:chunked

Updated compression format in Skopeo push step.

.github/workflows/build.yml

@@ -99,7 +99,7 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Push to GHCR via Skopeo (with ZSTD Compression)
+      - name: Push to GHCR via Skopeo (with zstd:chunked compression)
         if: github.event_name != 'pull_request' && github.ref == format('refs/heads/{0}', github.event.repository.default_branch)
         run: |
           set -x
@@ -107,11 +107,11 @@ jobs:
           export REGISTRY_AUTH_FILE=$HOME/.docker/config.json
           REGISTRY_PATH="${{ env.IMAGE_REGISTRY }}/${{ env.IMAGE_NAME }}"
 
-          # Nutzt das bewährte podman unshare, um den lokalen Storage fehlerfrei auszulesen
+          # Nutzt das native OCI zstd:chunked Format für optimierte Delta-Updates
           podman unshare bash -c "
             for tag in ${{ steps.metadata.outputs.tags }}; do
               skopeo copy \
-                --dest-compress-format=zstd \
+                --dest-compress-format=zstd:chunked \
                 --dest-compress-level=5 \
                 containers-storage:localhost/${{ env.IMAGE_NAME }}:${{ env.DEFAULT_TAG }} \
                 docker://$REGISTRY_PATH:\$tag