This repository provides a composite GitHub Action (`actions/upload-pages-artifact`) that packages static website files into a tar archive and uploads it as a workflow artifact for subsequent deployment to GitHub Pages. The action is designed to be used in a build job, producing an artifact that the `actions/deploy-pages` action can later deploy. It handles cross-platform nuances by using GNU tar on macOS (via `gtar`) and `--force-local` on Windows, ensuring consistent archive creation across all hosted runners. The architecture is straightforward: a composite action with three OS-specific archive steps (Linux, macOS, Windows) followed by a single upload step using `actions/upload-artifact`. Inputs include the source directory path, artifact name, retention days, and a flag to include hidden files. The action dereferences symbolic links, excludes `.git` and `.github` directories, and optionally excludes hidden files (those starting with a dot). The output is the uploaded artifact ID. Key implementation details include careful handling of tar flags (`--dereference --hard-dereference`), conditional exclusion patterns, and environment-specific commands. The action is well-documented with clear input/output contracts and is actively maintained with recent commits, automated dependency updates via Dependabot, and a release workflow that publishes major version tags. The codebase is small but robust, focusing on a single, well-defined responsibility with attention to edge cases across operating systems.