Ship Linux binaries via Homebrew

[voydz]

fithit was macOS-arm64 only, purely because of how it was distributed — the spec pinned target_arch='arm64', release built on a single macOS runner, and the tap formula had one url/sha256 pointing at a Mach-O tarball. brew install under Linuxbrew produced a binary the system could not execute.

The Python code was already portable (XDG data paths, stdlib urllib), so no source changes were needed.

Changes

• fithit.spec — target_arch=None, so builds follow the host arch. This was the hard blocker.
• Makefile — detects host os/arch, picks shasum vs sha256sum, names tarballs fithit-cli-<version>-<os>-<arch>.tar.gz. make build now runs the committed spec instead of duplicating flags, so the spec is no longer dead code diverging from the real build.
• packaging/fithit.rb.tmpl — the formula is now generated from this repo rather than hand-edited in the tap. on_macos/on_linux × on_arm/on_intel url+sha pairs, plus depends_on arch: :arm64 on macOS so Intel Macs get a clear Homebrew error rather than an unrunnable binary.
• release.yml — matrix over macos-14, ubuntu-22.04, ubuntu-22.04-arm. Each builds, smoke-tests, uploads its asset, and passes its checksum as an artifact; a bump-tap job renders the template with all three checksums and opens a tap PR. This replaces brew bump-formula-pr, which cannot express three url/sha pairs.
• ci.yml — build on all three platforms, so Linux breakage shows up on PRs instead of mid-release.

Linux is built on 22.04 rather than 24.04 because PyInstaller output is only forward-compatible w.r.t. glibc.

Supported platforms

Platform	Architecture
macOS	arm64
Linux	x86_64, arm64

No Intel macOS.

Verification

• PyInstaller build + smoke test pass on Linux x86_64 and arm64 (real containers).
• Full brew install on Linuxbrew from the rendered formula: installs, brew test passes, fithit --help and fithit info work, DB resolves to ~/.local/share/fithit/workouts.json.
• Formula resolves the correct URL under macOS arm64, linux/amd64 and linux/arm64; the arch requirement applies only on macOS.
• Makefile tarball naming matches the formula URLs on all three platforms.
• Binary runs on glibc 2.28+ (Rocky 8, Debian 11, Ubuntu 20.04/22.04).
• Test suite passes on Linux and macOS.

Notes

• The first commit is a standalone ruff format fix for pre-existing drift in parse.py that was failing make lint on main. Whitespace only.
• pyproject.toml version was stale at 0.1.0 despite releases up to v0.1.5; bumped to 0.2.0 so local make package names artifacts correctly.

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