fix REGISTRY_USERNAME to reuse cache between auto and pr jobs

Author: klensy

Diff for: src/ci/docker/run.sh

@@ -96,7 +96,9 @@ if [ -f "$docker_dir/$image/Dockerfile" ]; then
     docker --version
 
     REGISTRY=ghcr.io
-    REGISTRY_USERNAME=${GITHUB_REPOSITORY_OWNER:-rust-lang-ci}
+    # Hardcode username to reuse cache between auto and pr jobs
+    # FIXME: should be changed after move from rust-lang-ci
+    REGISTRY_USERNAME=rust-lang-ci
     # Tag used to push the final Docker image, so that it can be pulled by e.g. rustup
     IMAGE_TAG=${REGISTRY}/${REGISTRY_USERNAME}/rust-ci:${cksum}
     # Tag used to cache the Docker build