fix: add self-canonicals for sitemap routes - #91

No file matched to [/home/runner/work/starboard/starboard/**/*requirements*.txt,/home/runner/work/starboard/starboard/**/*requirements*.in,/home/runner/work/starboard/starboard/**/*constraints*.txt,/home/runner/work/starboard/starboard/**/*constraints*.in,/home/runner/work/starboard/starboard/**/pyproject.toml,/home/runner/work/starboard/starboard/**/uv.lock,/home/runner/work/starboard/starboard/**/*.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.