Add the ability to disable install

.gitignore

@@ -1 +1,2 @@
 variables.conf
+.disabled

install.sh

@@ -2,6 +2,11 @@
 
 source "$(dirname "$0")/variables.conf"
 
+if [ -f $run_directory/.disabled ]; then
+  echo "Installation is disabled. Exiting..."
+  exit 0
+fi
+
 # NOTE: the handling of init/service manager comes from this discussion:
 # https://unix.stackexchange.com/questions/18209/detect-init-system-using-the-shell