chore: Cleaned up ansible and added control script

ansible/roles/deploy/templates/runners-docker-compose.yml.j2

@@ -1,7 +1,6 @@
-# Generated by Ansible from dev_runner_count - do not hand-edit.
-# To change the number of runners, edit dev_runner_count in
-# ansible/group_vars/role_dev.yml and re-run playbooks/deploy.yml.
-# To change their shape, edit this template instead.
+# Generated by Ansible - do not hand-edit. Three Gitea Actions runners, always.
+# To change their shape (image, volumes, env), edit this template and re-run
+# playbooks/deploy.yml.
 #
 # GITEA_RUNNER_REGISTRATION_TOKEN is intentionally left as a compose variable
 # (not baked in here) - services/dev/spinup.sh generates a fresh token and
@@ -10,8 +9,9 @@
 # /data is a disposable local cache (runner identity re-registers on every
 # spinup.sh run anyway), so it's a plain named volume - not part of the S3
 # backup/restore stack in services/dev/backup-docker-compose.yml.
+{% set runner_count = 3 %}
 services:
-{% for i in range(1, dev_runner_count + 1) %}
+{% for i in range(1, runner_count + 1) %}
   runner-{{ i }}:
     image: gitea/act_runner:latest
     container_name: gitea_runner_{{ i }}
@@ -34,7 +34,7 @@ networks:
     external: true
 
 volumes:
-{% for i in range(1, dev_runner_count + 1) %}
+{% for i in range(1, runner_count + 1) %}
   gitea_runner_{{ i }}_data:
     name: gitea_runner_{{ i }}_data
 {% endfor %}