Description of the issue

In this repo, we have stand-alone scripts (sample programs) in 150+ languages, one of which is Rust. We use the same structure for all languages (archive/<first-letter>/<language-name> -- e.g., archive/r/rust). Each directory only has the sample programs, an auto-generated README, and a YAML file that describes how to build and run the sample program using a custom docker-based tool. We don't include any type of project configuration file like Cargo.toml, Cargo.lock, etc. Also, we do not allow our sample programs to include any type of dependencies. Everything must be done with built-in language functions, libraries, etc.

We do CodeQL scans for all of the supported languages. I was excited that Rust was recently added, so I did this PR. It resulted in the same "low percentage" warning as in #20643 , and I'm not sure that the scan actually did anything. Also, I tried to use manual mode, but I got an error that Rust does not support this. What do I need to do to get a proper scan of our Rust code?