bake: add basename, dirname and sanitize functions #2649
Merged
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These functions help with dealing with path inputs and using parts of them to configure targets.
For example, this improves cases like https://github.com/moby/buildkit/pull/5248/files#diff-870f6fe23fc034f008f5203ee1e628d7bfa65a49095d5a4688db498328449ed2R238 where current best approach is to take hash and lose readability of the variable.