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7a3b56b486
Mark .cargo/git and .cargo/registry as cache dirs Fixes #10457 ### What does this PR try to resolve? As we previously discussed in #10457 this marks `~/.cargo/git` and `~/.cargo/registry` as not to be included in backups, and not subject to content indexing. These directories can be fairly large and frequently changed, and should only contain content that can be re-downloaded if necessary. ### How should we test and review this PR? I did two manual tests: 1. Using the binary built from this tree, run `cargo update` in a source tree that has a git dependency, and observe that afterwards, there is a `CACHEDIR.TAG` in `~/.cargo/git`. 2. Similarly, run `cargo update` and observe that there's a `CACHEDIR.TAG` in `~/.cargo/registry`. (I ran this on Linux. This code should also trigger OS-specific behavior on macOS and Windows that's the same as is currently applied to `target/`.) I added some test assertions.