Just use the autogenerated one

It's _fine_.

ansible/roles/docker/files/pihole/docker-compose.yml

@@ -10,7 +10,6 @@ services:
     environment:
       - TZ=Europe/London
       - VIRTUAL_HOST=pihole.jakehoward.tech
-      - WEBPASSWORD={{ pihole_password }}
     volumes:
       - ./etc-pihole/:/etc/pihole/
       - ./etc-dnsmasq.d/:/etc/dnsmasq.d/

ansible/roles/docker/tasks/pihole.yml

@@ -1,6 +1,3 @@
-- name: Include pihole variables
-  include_vars: pihole.yml
-
 - name: Create pihole directory
   file:
     path: '/opt/pihole'

ansible/roles/docker/vars/pihole.yml

@@ -1,7 +0,0 @@
-pihole_password: !vault |
-  $ANSIBLE_VAULT;1.1;AES256
-  38313233396263393938393661653739623739393963633762323330333264383566313334333537
-  6336346162313266373134613135666530373866393038610a613834616465323464613534666663
-  34663437346266303130306339373436333863343732363230353731356534363134666135363431
-  3738323930336266610a353166636432633436323766316233316364396466656566373736396163
-  32626332383964343065643432653863306461666566343934383431646532363833