Add CI workflow and Nix flake configuration - #18
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The action had no CI at all. This adds a workflow that dogfoods the action (uses: ./) on its own repo and asserts it did its job: Nix is installed, direnv is on PATH, the .envrc marker env var was exported into the job environment (proving the .envrc -> direnv -> $GITHUB_ENV chain), and `nix flake check` passes. A minimal Nix fixture (flake.nix + flake.lock + .envrc) gives the action's direnv step something real to export and check. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01WqkgHeshKY4LuG2gR3FpTs
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Summary
This PR adds continuous integration infrastructure and Nix development environment configuration to the repository. It enables automated testing of the action in a real GitHub Actions environment (dogfooding) and provides a reproducible development setup.
Key Changes
CI Workflow (
.github/workflows/ci.yml): Added end-to-end test workflow that:.envrcare properly exported to the job environmentNix Flake Configuration (
flake.nix): Created a development flake that:NIX_MAGIC_SETUP_E2E) used by the CI workflow to verify the setup chain works end-to-endDirenv Integration (
.envrc): Added direnv configuration to automatically load the Nix flake environmentFlake Lock (
flake.lock): Added lock file pinning nixpkgs to a specific revision for reproducible buildsImplementation Details
The CI workflow serves as both a test suite and a practical demonstration of the action's functionality. By running the action on its own repository, it validates the complete integration chain: Nix installation → direnv setup → environment variable export. The marker variable pattern provides a concrete assertion that the
.envrc→ direnv → GitHub Actions environment export chain is working correctly.https://claude.ai/code/session_01WqkgHeshKY4LuG2gR3FpTs