feat: add antergos-welcome package

- New PKGBUILD for antergos-welcome GTK3 Python app
- Installs to /usr/share/antergos-next/antergos-welcome/
- Wrapper script at /usr/bin/antergos-welcome
- Depends on gtk3, python, python-gobject, python-cairo
- Compiles .po translation files

packages.yaml

@@ -8,4 +8,5 @@ packages:
   - cnchi
   - calamares
   - calamares-branding-antergos-next
-  - antergos-next-memes
+  - antergos-next-memes
+  - antergos-welcome

packages/antergos-welcome/PKGBUILD

@@ -0,0 +1,43 @@
+# Maintainer: Celestia Ludenberg <ash8820@proton.me>
+# Contributor: Antergos NeXT Team
+
+pkgname=antergos-welcome
+pkgver=0.1
+pkgrel=1
+pkgdesc="Welcome screen and support tool for new Antergos NeXT users"
+arch=('any')
+url="https://github.com/Antergos-NeXT/antergos-welcome"
+license=('GPL3')
+depends=(
+  'gtk3'
+  'python'
+  'python-gobject'
+  'python-cairo'
+)
+makedepends=('git')
+source=("${pkgname}::git+https://github.com/Antergos-NeXT/antergos-welcome.git")
+sha256sums=('SKIP')
+
+package() {
+  cd "${srcdir}/${pkgname}"
+
+  install -dm755 "${pkgdir}/usr/share/antergos-next/antergos-welcome"
+
+  cp -r src "${pkgdir}/usr/share/antergos-next/antergos-welcome/"
+  cp -r data "${pkgdir}/usr/share/antergos-next/antergos-welcome/"
+  cp -r ui "${pkgdir}/usr/share/antergos-next/antergos-welcome/"
+  cp -r po "${pkgdir}/usr/share/antergos-next/antergos-welcome/"
+  cp -r utils "${pkgdir}/usr/share/antergos-next/antergos-welcome/"
+
+  find "${pkgdir}/usr/share/antergos-next/antergos-welcome/po" -name "*.po" -exec msgfmt -o {}.mo {} \; 2>/dev/null || true
+
+  install -dm755 "${pkgdir}/usr/bin"
+  cat > "${pkgdir}/usr/bin/antergos-welcome" << 'EOF'
+#!/bin/bash
+exec /usr/bin/python3 /usr/share/antergos-next/antergos-welcome/src/antergos_welcome.py "$@"
+EOF
+  chmod 755 "${pkgdir}/usr/bin/antergos-welcome"
+
+  install -dm755 "${pkgdir}/usr/share/applications"
+  cp antergos-welcome.desktop "${pkgdir}/usr/share/applications/"
+}