chore: fix artifact upload for container build (#7565)

.github/workflows/container.yml

@@ -118,7 +118,7 @@ jobs:
         name: Upload digest
         uses: actions/upload-artifact@v4
         with:
-          name: digests
+          name: digests-${{ matrix.arch }}
           path: /tmp/digests
           if-no-files-found: error
           retention-days: 1
@@ -141,8 +141,9 @@ jobs:
         name: Download digests
         uses: actions/download-artifact@v4
         with:
-          name: digests
+          pattern: digests-*
           path: /tmp/digests
+          merge-multiple: true
       -
         name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3