don't attempt to use the same artifact names

Author: jacobbednarz

.github/workflows/build_image.yml

@@ -50,7 +50,7 @@ jobs:
       - name: Upload digest
         uses: actions/upload-artifact@v4
         with:
-          name: digests
+          name: digest-${{ matrix.platform }}
           path: /tmp/digests/*
           if-no-files-found: error
           retention-days: 1
@@ -63,8 +63,9 @@ jobs:
       - name: Download digests
         uses: actions/download-artifact@v4
         with:
-          name: digests
           path: /tmp/digests
+          pattern: digests-*
+          merge-multiple: true
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Docker meta