diff --git a/.github/workflows/build-bluebuild.yml b/.github/workflows/build-bluebuild.yml
index 62b9726..1dee2bf 100644
--- a/.github/workflows/build-bluebuild.yml
+++ b/.github/workflows/build-bluebuild.yml
@@ -166,7 +166,8 @@ jobs:
 
           # Diagnostic: confirm the keypair landed where bluebuild expects.
           ls -la bluebuild/
-          file bluebuild/cosign.pub bluebuild/cosign.key 2>&1 | head -4
+          head -1 bluebuild/cosign.pub
+          head -1 bluebuild/cosign.key | cut -c1-30
 
           podman run --rm \
             --privileged \