feat(packaging): add relspec-bin AUR package

- Add linux/arch/relspec-bin/PKGBUILD using prebuilt release tarballs
- Move source PKGBUILD to linux/arch/relspec/PKGBUILD
- Release: build static binaries, pack linux tarballs (binary + LICENSE)
- AUR job: matrix over relspec and relspec-bin
- Makefile: bump pkgver in both PKGBUILDs

linux/arch/relspec-bin/PKGBUILD

@@ -0,0 +1,24 @@
+# Maintainer: Hein (Warky Devs) <hein@warky.dev>
+pkgname=relspec-bin
+pkgver=1.0.90
+pkgrel=1
+pkgdesc="RelSpec is a comprehensive database relations management tool that reads, transforms, and writes database table specifications across multiple formats and ORMs."
+arch=('x86_64' 'aarch64')
+url="https://git.warky.dev/wdevs/relspecgo"
+license=('MIT')
+provides=('relspec')
+conflicts=('relspec')
+options=('!debug')
+source_x86_64=("$pkgname-$pkgver-x86_64.tar.gz::$url/releases/download/v$pkgver/relspec_${pkgver}_linux_amd64.tar.gz")
+source_aarch64=("$pkgname-$pkgver-aarch64.tar.gz::$url/releases/download/v$pkgver/relspec_${pkgver}_linux_arm64.tar.gz")
+sha256sums_x86_64=('SKIP')
+sha256sums_aarch64=('SKIP')
+
+package() {
+    # Binary
+    install -Dm755 "relspec" "$pkgdir/usr/bin/relspec"
+    install -Dm644 "LICENSE" "$pkgdir/usr/share/licenses/$pkgname/LICENSE"
+
+    # Default config dir
+    install -dm755 "$pkgdir/etc/relspec"
+}