feat(paperless-gpt): add chart - #22

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: azure/setup-helm@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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