what started as a function turned into a subshell

Signed-off-by: Mattia Rizzolo <mapreri@ubuntu.com>

cron.sh

@@ -17,7 +17,7 @@ run_script() (
     fi
     # Create a temporary build directory
     build_dir="$(mktemp -d deploy-XXXXXXXXX -p /tmp)"
-    trap 'rm -rfv "$build_dir"' RETURN
+    trap 'rm -rfv "$build_dir"' EXIT
 
     # Switch to the temporary build directory
     cd "${build_dir}"