feat: initial PKGBUILD collection for the Moonarch ecosystem

Add PKGBUILDs for moonset-git, moonlock-git, and moongreet-git.
Intended as a paru custom AUR source for easy installation of
all Moonarch components via `paru -S moonset-git`.

moongreet-git/PKGBUILD

@@ -0,0 +1,48 @@
+# ABOUTME: PKGBUILD for Moongreet — greetd greeter for Wayland.
+# ABOUTME: Builds from git source with automatic version detection.
+
+# Maintainer: Dominik Kressler
+
+pkgname=moongreet-git
+pkgver=0.3.1.r5.g4c9b436
+pkgrel=1
+pkgdesc="A greetd greeter for Wayland with GTK4 and Layer Shell"
+arch=('x86_64')
+url="https://gitea.moonarch.de/nevaforget/greetd-moongreet"
+license=('MIT')
+depends=(
+    'gtk4'
+    'gtk4-layer-shell'
+    'greetd'
+)
+makedepends=(
+    'git'
+    'cargo'
+)
+provides=('moongreet')
+conflicts=('moongreet')
+install=moongreet.install
+source=("git+${url}.git")
+sha256sums=('SKIP')
+
+pkgver() {
+    cd "$srcdir/greetd-moongreet"
+    git describe --long --tags | sed 's/^v//;s/-/.r/;s/-/./'
+}
+
+build() {
+    cd "$srcdir/greetd-moongreet"
+    cargo build --release --locked
+}
+
+package() {
+    cd "$srcdir/greetd-moongreet"
+    install -Dm755 target/release/moongreet "$pkgdir/usr/bin/moongreet"
+
+    # Greeter config
+    install -Dm644 config/moongreet.toml "$pkgdir/etc/moongreet/moongreet.toml"
+
+    # Cache directories
+    install -dm755 "$pkgdir/var/cache/moongreet"
+    install -dm755 "$pkgdir/var/cache/moongreet/last-session"
+}