fix(ci): use unique artifacts names.

Not specifying a unique name for the artifact file would lead to the
following error:

Failed to CreateArtifact: Received non-retryable error: Failed request:
(409) Conflict: an artifact with this name already exists on the
workflow run

Fixed by specifying an artifact name that depends on the platform its
been built for.

Author: qkaiser

.github/workflows/build-publish-image.yml

@@ -94,7 +94,7 @@ jobs:
       - name: Upload digest
         uses: actions/upload-artifact@v4
         with:
-          name: digests
+          name: ${{ matrix.platform }}-digests
           path: /tmp/digests/*
           if-no-files-found: error
           retention-days: 1