Add PKGBUILD and release workflow for package distribution

PKGBUILD

@@ -0,0 +1,45 @@
+# Maintainer: Owlibou
+pkgname=owlen
+pkgver=0.1.0
+pkgrel=1
+pkgdesc="Terminal User Interface LLM client for Ollama with chat and code assistance features"
+arch=('x86_64' 'aarch64')
+url="https://somegit.dev/Owlibou/owlen"
+license=('AGPL-3.0-only')
+depends=('gcc-libs')
+makedepends=('cargo' 'git')
+source=("${pkgname}-${pkgver}.tar.gz::https://somegit.dev/Owlibou/owlen/archive/v${pkgver}.tar.gz")
+sha256sums=('SKIP')  # Update this after first release
+
+prepare() {
+    cd "$pkgname"
+    export RUSTUP_TOOLCHAIN=stable
+    cargo fetch --locked --target "$(rustc -vV | sed -n 's/host: //p')"
+}
+
+build() {
+    cd "$pkgname"
+    export RUSTUP_TOOLCHAIN=stable
+    export CARGO_TARGET_DIR=target
+    cargo build --frozen --release --all-features
+}
+
+check() {
+    cd "$pkgname"
+    export RUSTUP_TOOLCHAIN=stable
+    cargo test --frozen --all-features
+}
+
+package() {
+    cd "$pkgname"
+
+    # Install binaries
+    install -Dm755 "target/release/owlen" "$pkgdir/usr/bin/owlen"
+    install -Dm755 "target/release/owlen-code" "$pkgdir/usr/bin/owlen-code"
+
+    # Install license
+    install -Dm644 LICENSE "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
+
+    # Install documentation
+    install -Dm644 README.md "$pkgdir/usr/share/doc/$pkgname/README.md"
+}