keep .git when cleaning dist

[celex3]

When cleaning the dist directory before moving build artifacts from the staging area, if a .git file exists, it should not be removed. This allows Trunk to build into a git worktree, for example.

This behavior also exists in Vite which was introduced in this PR. Part of their justification is that a .git file could not be generated by Vite, but I'm not sure if this invariant holds for Trunk.

[ctron]

Sounds reasonable and looks good to me.

Might be cool to have a list instead of "or".

[celex3]

Something like this?

if [STAGE_DIR, ".git"].iter().any(|s| entry.file_name() == *s) {
    continue;
}

I also tried using contains but converting the OsString to a &&str is a little cumbersome:

if [STAGE_DIR, ".git"].contains(&&*entry.file_name().to_string_lossy()) {
    continue;
}

I feel like the "or" is a little more readable than either of these, but there might be a better way that what I have here.

[ctron]

I though about adding a const list, and the using that list. So that, later on, that can easily be extended.

[duke-m]

what about having something (sketched) like this in pub struct clean and using it here:

    #[arg(short, long, env = "TRUNK_CLEAN_PRESERVE_FILES")]
    pub preserve_files: Option<Vec<String>>