lifecycle: fix missing krb5 deps for full testing in image (#11815)

Signed-off-by: Jens Langhammer <jens@goauthentik.io>

lifecycle/ak

@@ -54,6 +54,8 @@ function cleanup {
 }
 
 function prepare_debug {
+    export DEBIAN_FRONTEND=noninteractive
+    apt-get update
     apt-get install -y --no-install-recommends krb5-kdc krb5-user krb5-admin-server
     VIRTUAL_ENV=/ak-root/venv poetry install --no-ansi --no-interaction
     touch /unittest.xml