fix: support Linux real-time signals - #15

No file matched to [/home/runner/work/brush/brush/**/*requirements*.txt,/home/runner/work/brush/brush/**/*requirements*.in,/home/runner/work/brush/brush/**/*constraints*.txt,/home/runner/work/brush/brush/**/*constraints*.in,/home/runner/work/brush/brush/**/pyproject.toml,/home/runner/work/brush/brush/**/uv.lock,/home/runner/work/brush/brush/**/*.py.lock]. The cache will never get invalidated. Make sure you have checked out the target repository and configured the cache-dependency-glob input correctly.