build: remove unsed ImageBuilder after 24h

The server still requires more storage than needed, automatically remove
ImageBuilder that haven't been used within the last 24 hours.

Signed-off-by: Paul Spooren <mail@aparcar.org>

asu/build.py

@@ -391,7 +391,7 @@ def download_file(filename: str, dest: str = None):
             last_build_timestamp.decode(),
         )
 
-        if now_timestamp - int(last_build_timestamp.decode()) > 60 * 60 * 24 * 7:
+        if now_timestamp - int(last_build_timestamp.decode()) > 60 * 60 * 24:
             log.info("Removing unused ImageBuilder for %s", target_subtarget)
             job.connection.hdel(
                 f"worker:{job.worker_name}:last_build", target_subtarget