diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 5b4b20c..463cf3a 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -70,6 +70,7 @@ jobs:
       - uses: docker/build-push-action@v7
         with:
           context: .
+          file: docker/Dockerfile
           push: true
           platforms: linux/amd64
           # Single-manifest images (no provenance/SBOM attestation children) so