add workflow for updating AUR package (#6)

scripts/aur_bump.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+set -e
+
+VERSION=$(git describe --tags --abbrev=0 | tr -d 'v')
+SHASUM=$(sha256sum "dist/VencordDesktop-$VERSION.tar.gz" | awk '{ print $1 }')
+
+git clone ssh://aur@aur.archlinux.org/vencord-desktop-bin.git aurpkg
+
+cd aurpkg
+
+sed -i "s/^pkgver=.*$/pkgver=$VERSION/" PKGBUILD
+sed -i "s/^sha256sums=('.*'/sha256sums=('$SHASUM'/" PKGBUILD
+makepkg --printsrcinfo > .SRCINFO
+
+git commit -a -m "Bump version to $VERSION"
+git push
+
+cd ..
+rm -rf aurpkg