lifecycle: fix check_if_root not working without docker

Signed-off-by: Jens Langhammer <jens.langhammer@beryju.org>

lifecycle/bootstrap.sh

@@ -9,16 +9,18 @@ function check_if_root {
         return
     fi
     SOCKET="/var/run/docker.sock"
+    GROUP="authentik"
     if [[ -e "$SOCKET" ]]; then
         # Get group ID of the docker socket, so we can create a matching group and
         # add ourselves to it
         DOCKER_GID=$(stat -c '%g' $SOCKET)
         getent group $DOCKER_GID || groupadd -f -g $DOCKER_GID docker
         usermod -a -G $DOCKER_GID authentik
+        GROUP="authentik:docker"
     fi
     # Fix permissions of backups and media
     chown -R authentik:authentik /media /backups
-    chpst -u authentik:authentik:docker env HOME=/authentik $1
+    chpst -u authentik:$GROUP env HOME=/authentik $1
 }
 
 if [[ "$1" == "server" ]]; then