feat: ✨ add pacman hooks and install script

install.fish

@@ -0,0 +1,6 @@
+#!/bin/fish
+cp ./pacman/snap-pac-uki-create.fish /usr/local/bin
+echo "installed creation script."
+
+cp ./pacman/hooks/* /usr/share/libalpm/hooks/
+echo "installed pacman hooks."

pacman/hooks/01_snap-pac-uki_pre.hook

@@ -0,0 +1,12 @@
+[Trigger]
+Operation = Upgrade
+Operation = Install
+Operation = Remove
+Type = Package
+Target = *
+
+[Action]
+Description = Performing pre UKI creation...
+When = PreTransaction
+Exec = /usr/local/bin/snap-pac-uki-create.fish
+AbortOnFail

pacman/hooks/zz_snap-pac-uki_post.hook

@@ -0,0 +1,11 @@
+[Trigger]
+Operation = Upgrade
+Operation = Install
+Operation = Remove
+Type = Package
+Target = *
+
+[Action]
+Description = Performing post UKI creation...
+When = PostTransaction
+Exec = /usr/local/bin/snap-pac-uki-create.fish