Include pkgrel in the local source filename

Artifact rebuilds (e.g. dependency bundling) change the file behind
<pkg>-<ver>.tar.zst while keeping its name, so users with the previous
file in their AUR helper cache hit a checksum mismatch. Naming the local
download <pkg>-<ver>-<rel>.tar.zst makes every rebuild a fresh file.

linux-wallpaperengine-bin/PKGBUILD

@@ -14,7 +14,7 @@ depends=('lz4' 'ffmpeg' 'mpv' 'glfw' 'glew' 'freeglut' 'libpulse' 'libcups'
 provides=('linux-wallpaperengine')
 conflicts=('linux-wallpaperengine' 'linux-wallpaperengine-git')
 options=('!strip' '!debug')
-source=("https://github.com/Felitendo/PKGBUILDS/releases/download/${pkgname}-${pkgver}/${pkgname}-${pkgver}.tar.zst")
+source=("${pkgname}-${pkgver}-${pkgrel}.tar.zst::https://github.com/Felitendo/PKGBUILDS/releases/download/${pkgname}-${pkgver}/${pkgname}-${pkgver}.tar.zst")
 sha256sums=('ed71a7ca046003c368b6af7aa9766dee36cd5da84921a4a34991248d62d7bc6b')
 
 package() {