Update Gitea role for docker_compose_deploy

- Add MariaDB to dev playbook
- Set Git user in "users:"
- Define Gitea external compose project
- Forward SSH port in forwarding script
- Create user groups with system users
- Install python3-pymysql for Ansible
- Strip old Gitea deployment methods
- Bind MariaDB to docker0 for Docker access

dev/gitea.yml

@@ -6,4 +6,5 @@
   roles:
     - base
     - docker
+    - mariadb
     - gitea