Disable registry index fetch optimization

This breaks with the sparse index being on by default. The right fix
might be to configure Cargo to continue using the git index, but it's
not super clear and potentially with the sparse index the fetches will
be fast enough that we don't need to worry that much.

Author: Mark-Simulacrum

src/cli.rs

@@ -545,7 +545,7 @@ impl Crater {
     fn workspace(&self, docker_env: Option<&str>, fast_init: bool) -> Result<Workspace, Error> {
         let mut builder = WorkspaceBuilder::new(&crater::dirs::WORK_DIR, &crater::USER_AGENT)
             .fast_init(fast_init)
-            .fetch_registry_index_during_builds(false)
+            .fetch_registry_index_during_builds(true)
             .command_timeout(Some(Duration::from_secs(15 * 60)))
             .command_no_output_timeout(Some(Duration::from_secs(5 * 60)))
             .running_inside_docker(std::env::var("CRATER_INSIDE_DOCKER").is_ok());