message: make the env variable even longer
diff: @@ -79,7 +79,7 @@ impl RustwideBuilder {
  .unwrap_or(false);
  let mut builder = WorkspaceBuilder::new(Path::new(workspace_path), USER_AGENT)
  .running_inside_docker(is_docker);
  - if let Ok(custom_image) = std::env::var("DOCS_RS_LOCAL_IMAGE") {
  + if let Ok(custom_image) = std::env::var("DOCS_RS_LOCAL_DOCKER_IMAGE") {
  builder = builder.sandbox_image(SandboxImage::local(&custom_image)?);
  }
  