feat: verify we are root

update.py

@@ -3,6 +3,7 @@
 from __future__ import annotations
 
 from functools import lru_cache
+from os import geteuid
 from pathlib import Path
 from subprocess import call, check_output
 from datetime import datetime
@@ -14,6 +15,9 @@ KEEP_DAYS = 3
 
 
 def main():
+    if not are_we_root():
+        print("we must be root")
+        exit(1)
     setup_logger()
     build_images()
     update_containers()
@@ -149,6 +153,10 @@ def setup_logger() -> None:
     logging.info('set up logger')
 
 
+def are_we_root() -> bool:
+    return geteuid() == 0
+
+
 if __name__ == "__main__":
     main()