The retry action lacks the output needed for the digests. Use metadata-file and read it in the next step

Signed-off-by: Adam Warner <[email protected]>

Author: PromoFaux

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

@@ -101,13 +101,20 @@ jobs:
               --platform ${{ matrix.platform }} \
               --target build \
               --label "${{ steps.meta.outputs.labels }}" \
+              --metadata-file "/tmp/build-metadata-${{ env.PLATFORM_PAIR }}.json" \
               --output "type=image,name=${{ env.DOCKER_REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true" \
               ftl-build
 
       - name: Export digests
         run: |
           mkdir -p /tmp/digests/
-          digest="${{ steps.build.outputs.digest }}"
+          digest="$(jq -r '\"containerimage.digest\"' "/tmp/build-metadata-${{ env.PLATFORM_PAIR }}.json")"
+
+          if [[ -z "${digest}" || "${digest}" == "null" ]]; then
+            echo "Digest not found in buildx metadata file" >&2
+            cat "/tmp/build-metadata-${{ env.PLATFORM_PAIR }}.json" >&2 || true
+            exit 1
+          fi
           touch "/tmp/digests/${digest#sha256:}"
 
       - name: Upload digest