Add PKGBUILD stable and -git, AUR publish and Arch build GitHub Actions (#31)

* Create AUR_publish.yml

* Added PKGBUILD

* Switched AUR publish addon

* Added arch-build action

* Remove useless step in arch-build

* Checkout latest tag instead of master for Arch and Fedora publish actions

* Added -git PKGBUILD and added wlroots < 0.16 as dependency

* Checkout master before running swayfx-git aur script

* Check build for stable PKGBUILD after -git version

* Removed spaces in wlroots depends version

build-scripts/aur-git/sway.install

@@ -0,0 +1,31 @@
+post_install() {
+cat << EOD
+Sway requires additional setup for privilege escalation. Without this setup,
+sway will fail to start with session activation permission failures. Choose one
+of the two available options (In alphabetical, not recommended, order):
+
+1. polkit: This will make sway "just work" right after installation but may be
+           a weightier solution than desired.
+
+2. seatd: Already required as a sway dependency, this is a lighter-weight
+          solution but requires some user configuration: Enabling the service,
+          adding your user to the "seat" group, then logging out/in again.
+
+Either option should provide the same functionality/stability. Refer to the
+Sway wiki page for information.
+EOD
+}
+
+post_upgrade() {
+cat << EOD
+Sway's necessary privileges can now be obtained through seatd as well as the
+incumbent polkit package. As such, polkit has been relegated to an optional
+dependency.
+
+Note that using seatd instead of polkit means that a user must be a part of the
+"seat" group: Otherwise, the user will not be able to achieve the appropriate
+privileged actions.
+
+For more information, refer to the Sway wiki page.
+EOD
+}