Private crates are not supported even with `net.git-fetch-with-cli = true`

.cargo/config.toml:

[net]
git-fetch-with-cli = true

However, when compiling with bitbake, it cannot find the private crates.

| Caused by:
|   failed to load source for dependency `rust-protobufs`
| 
| Caused by:
|   Unable to update https://abc.com/git/rust-protobufs.git?branch=main#a27c537d
| 
| Caused by:
|   failed to clone into: /home/ubuntu/build/tmp/work/cortexa9t2hf-neon-poky-linux-gnueabi/program/1.0+gitAUTOINC+6a7aae1cbf-r0/cargo_home/git/db/rust-protobufs-de8201c5bac7b8be
| 
| Caused by:
|   failed to authenticate when downloading repository
| 
|   * attempted to find username/password via git's `credential.helper` support, but failed
| 
|   if the git CLI succeeds then `net.git-fetch-with-cli` may help here
|   https://doc.rust-lang.org/cargo/reference/config.html#netgit-fetch-with-cli
| 
| Caused by:
|   failed to acquire username/password from local configuration
| WARNING: exit code 101 from a shell command.

What is the workaround for this?

Start with the .cargo/config.toml settings shown in the report and reproduce the failure during the BitBake compile step. Inspect how private rust-protobufs Git dependencies are fetched and how Git credential helpers are reached. Done means the issue has a verified workaround or support fix for authenticated private crates with net.git-fetch-with-cli = true.