Update e2e.yaml

Author: imjasonh

.github/workflows/e2e.yaml

@@ -26,8 +26,9 @@ jobs:
       run: |
         set -euxo pipefail
 
-        # Setup local registry
+        # Setup local registry, wait a bit for it to come up.
         go run ./cmd/registry &
+        sleep 1
 
         base=alpine
         platform=linux/amd64