feat: add Arch Linux package and CI workflow

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packaging/arch/PKGBUILD

@@ -0,0 +1,23 @@
+# Maintainer: Elias Kohout <elias@kohout.de>
+pkgname=axolotl
+pkgver=0.1.0
+pkgrel=1
+pkgdesc="CLI-native issue tracker using SQLite"
+arch=('x86_64' 'aarch64')
+url="https://g.eliaskohout.de/eliaskohout/axolotl"
+license=('MIT')
+makedepends=('go')
+source=("$pkgname-$pkgver.tar.gz::https://g.eliaskohout.de/eliaskohout/axolotl/archive/v$pkgver.tar.gz")
+sha512sums=('SKIP')
+
+export GOTOOLCHAIN=auto
+
+build() {
+	cd "$srcdir/$pkgname-$pkgver/src"
+	go build -ldflags="-s -w" -trimpath -o "$pkgname" .
+}
+
+package() {
+	install -Dm755 "$srcdir/$pkgname-$pkgver/src/$pkgname" "$pkgdir/usr/bin/$pkgname"
+	ln -s "$pkgname" "$pkgdir/usr/bin/ax"
+}