feat: increase act_runner capacity for parallel job execution

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

ansible/roles/gitea-actions/defaults/main.yml

@@ -3,6 +3,7 @@ gitea_runner_user: gitea-runner
 gitea_runner_home: /home/gitea-runner
 gitea_runner_version: "0.2.13"
 gitea_runner_arch: linux-amd64
+gitea_runner_capacity: 4
 
 # Multiple Gitea instances to run actions runners for
 gitea_runners:

ansible/roles/gitea-actions/templates/config.yaml.j2

@@ -3,7 +3,7 @@ log:
 
 runner:
   file: {{ act_runner_work_dir }}/{{ runner_name }}/.runner
-  capacity: 1
+  capacity: {{ gitea_runner_capacity | default(4) }}
   timeout: 3h
   insecure: false
   fetch_timeout: 5s