ruff

0dbceccb - Only build the `fuzz` crate on `main` (#14478)

Only build the `fuzz` crate on `main` (#14478) It's not actually doing anything per pull request and it's pretty slow? xref #14469 It seems useful to build on `main` still to find build regressions? e.g. https://github.com/astral-sh/ruff/issues/9368