packaging: republish python-pywal to [breadway]

python-pywal was dropped from Arch's [extra] repo (AUR-only now), so
`pacstrap` can no longer resolve it and every ISO build fails with
"target not found: python-pywal". The `wal` binary is load-bearing —
bread-theme shells out to it to extract the colour palette from the
user's wallpaper.

Republish it the same way as calamares / bibata / powerlevel10k /
yay-bin:

- `packaging/python-pywal/PKGBUILD` — in-house copy of the AUR PKGBUILD
  (Morten Linderud's), modernised to `python -m build` / `installer`
  instead of the removed `setup.py install`, sha256-only sources like
  the sibling PKGBUILDs. Test-built locally: 28 unit tests pass, package
  ships `/usr/bin/wal`.
- `.forgejo/workflows/python-pywal.yml` — builds + PUTs to the Forgejo
  Arch registry on a push to `packaging/python-pywal/**`.
- `signed-repo.yml` gains it as a `workflow_run` trigger;
  `ci-publish-signed-repo.sh` gains it in `PACKAGES` so the signed
  dl.breadway.dev/arch db picks it up.
- packages.x86_64 keeps the `python-pywal` line (now sourced from
  [breadway]) with a note.

Ordering: `python-pywal.yml` must publish to the registry once before
`signed-repo.yml` runs, or the collect step errors "registry db missing
packages: python-pywal".

packaging/arch/README.md

@@ -3,7 +3,7 @@ Arch packaging
 
 This directory only holds `PKGBUILD`s for third-party AUR packages BOS
 republishes to the `[breadway]` pacman repo (`calamares`, `bibata`,
-`powerlevel10k`, `yay-bin`) — not the user's own code. See each
+`powerlevel10k`, `yay-bin`, `python-pywal`) — not the user's own code. See each
 subdirectory's `.forgejo/workflows/<name>.yml` (in this repo) for how each
 one publishes on a push to `packaging/<name>/**`.
 

packaging/python-pywal/PKGBUILD

@@ -0,0 +1,44 @@
+# BOS in-house rebuild of python-pywal.
+#
+# python-pywal was dropped from Arch's [extra] repo (it is now AUR-only), but
+# BOS needs the `wal` binary: bread-theme shells out to it to extract a colour
+# palette from the user's wallpaper. Republished to [breadway] so the ISO can
+# pull it via pacman, same pattern as calamares / bibata / powerlevel10k /
+# yay-bin. Source of truth: https://aur.archlinux.org/packages/python-pywal
+#
+# Maintainer: Breadway <plasticbread849@gmail.com>
+# Upstream maintainer: Morten Linderud <foxboron@archlinux.org>
+# Contributor: Sean Haugh <seanphaugh@gmail.com>
+
+pkgname=python-pywal
+pkgver=3.3.0
+pkgrel=11
+pkgdesc="Generate and change colorschemes on the fly"
+arch=('any')
+url="https://github.com/dylanaraps/pywal/"
+license=('MIT')
+depends=('python' 'imagemagick')
+makedepends=('python-build' 'python-installer' 'python-wheel' 'python-setuptools')
+optdepends=('feh: set wallpaper'
+            'nitrogen: set wallpaper')
+# BOS PKGBUILDs verify sources by sha256 only (no source PGP), matching
+# calamares / powerlevel10k here.
+source=("$pkgname-$pkgver.tar.gz::https://github.com/dylanaraps/pywal/archive/${pkgver}.tar.gz")
+sha256sums=('fe8fc1c29d1cad1a1a8580293dcfe32e1fac259f9dbfd5c8877439fa5948d189')
+
+build() {
+  cd "pywal-${pkgver}"
+  # setup.py-only project: python-build injects the setuptools backend.
+  python -m build --wheel --no-isolation
+}
+
+check() {
+  cd "pywal-${pkgver}"
+  python -m unittest discover -vs tests
+}
+
+package() {
+  cd "pywal-${pkgver}"
+  python -m installer --destdir="$pkgdir" dist/*.whl
+  install -Dm644 LICENSE.md "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
+}