[workflow] add experimental AUR release workflow

OK, so I don't know how to test this, but *theoretically*, this should
automatically push releases to AUR.

PKGBUILD.template

@@ -0,0 +1,45 @@
+# Maintainer: Tobias Witek <tobi@tobi-wan-kenobi.at>
+# Contributor: Daniel M. Capella <polycitizen@gmail.com>
+# Contributor: spookykidmm <https://github.com/spookykidmm>
+
+pkgname=bumblebee-status
+pkgver=<PKGVERSION>
+pkgrel=1
+pkgdesc='Modular, theme-able status line generator for the i3 window manager'
+arch=('any')
+url=https://github.com/tobi-wan-kenobi/bumblebee-status
+license=('MIT')
+depends=('python' 'python-netifaces' 'python-psutil' 'python-requests')
+optdepends=('xorg-xbacklight: to display a displays brightness'
+            'xorg-xset: enable/disable automatic screen locking'
+            'libnotify: enable/disable automatic screen locking'
+            'dnf: display DNF package update information'
+            'xorg-setxkbmap: display/change the current keyboard layout'
+            'redshift: display the redshifts current color'
+            'pulseaudio: control pulseaudio sink/sources'
+            'xorg-xrandr: enable/disable screen outputs'
+            'pacman: display current status of pacman'
+            'iputils: display a ping'
+            'python-i3ipc: display titlebar'
+            'fakeroot: dependency of the pacman module'
+            'python-pytz: timezone conversion for datetimetz module'
+            'python-tzlocal: retrieve system timezone for datetimetz module'
+)
+source=("$pkgname-$pkgver.tar.gz::$url/archive/v$pkgver.tar.gz")
+sha512sums=('<SHA512SUM>')
+
+package() {
+  install -d "$pkgdir"/usr/bin \
+    "$pkgdir"/usr/share/$pkgname/bumblebee_status/{core,util} \
+    "$pkgdir"/usr/share/$pkgname/bumblebee_status/modules/{core,contrib} \
+    "$pkgdir"/usr/share/$pkgname/themes/icons
+  ln -s /usr/share/$pkgname/$pkgname "$pkgdir"/usr/bin/$pkgname
+  ln -s /usr/share/$pkgname/bumblebee-ctl "$pkgdir"/usr/bin/bumblebee-ctl
+
+  cd $pkgname-$pkgver
+  cp -a --parents $pkgname bumblebee_status/{,core/,util/,modules/core/,modules/contrib/}*.py \
+    themes/{,icons/}*.json $pkgdir/usr/share/$pkgname
+  cp -r bin $pkgdir/usr/share/$pkgname/
+
+  install -Dm644 LICENSE "$pkgdir"/usr/share/licenses/$pkgname/LICENSE
+}