feat(pkgbuilds): add anaconda dependencies packaging

Add PKGBUILD files for four Anaconda installer dependencies:
- pykickstart: Kickstart language parser (>= 3.73)
- python-blivet: Storage management abstraction layer
- python-productmd: OS product metadata parsers
- python-requests-file: file:// URL transport adapter for requests

These packages are required by rhinstaller but absent from Arch repos and AUR.
All use manual module installation to avoid unnecessary build dependencies.

Also fix .gitignore by removing pkgbuilds/ exclusion to allow tracking these new packages.

pkgbuilds/pykickstart/PKGBUILD

@@ -0,0 +1,28 @@
+# Maintainer: FWS
+# Dépendance de l'installateur Anaconda (rhinstaller) — parseur du langage
+# Kickstart (Anaconda l'exige >= 3.73 ; absent des dépôts Arch et de l'AUR).
+# Pur Python (setuptools, install_requires=['requests']) : on installe
+# l'arborescence du module à la main pour éviter d'exiger python-build/installer.
+pkgname=pykickstart
+pkgver=3.74
+pkgrel=1
+pkgdesc="Library for manipulating kickstart files (dépendance Anaconda)"
+arch=('any')
+url="https://github.com/pykickstart/pykickstart"
+license=('GPL-2.0-or-later')
+depends=('python' 'python-requests')
+_tag="r$pkgver"
+source=("$pkgname-$pkgver.tar.gz::https://github.com/pykickstart/pykickstart/archive/refs/tags/$_tag.tar.gz")
+sha256sums=('05b19c5af3453f90464428c418b0c79bbe0a87718d1db1812f9006ba151e5c63')
+_srcdir="pykickstart-$_tag"
+
+package() {
+  cd "$srcdir/$_srcdir"
+  local sitedir
+  sitedir=$(python -c 'import site; print(site.getsitepackages()[0])')
+  install -d "$pkgdir$sitedir"
+  cp -a pykickstart "$pkgdir$sitedir/pykickstart"
+  # -d : grave le chemin d'exécution réel dans les .pyc (pas le $pkgdir de build).
+  python -m compileall -q -d "$sitedir/pykickstart" "$pkgdir$sitedir/pykickstart" || true
+  install -Dm644 COPYING "$pkgdir/usr/share/licenses/$pkgname/COPYING"
+}