Fix gitea admin deployment to be less brittle

Admin deployment was very timing-dependent: If the server took a while
to set it up, it would always error out while deploying. This commit
adds sufficient grace-time into the admin request call before the error
occurs which should avoid it in most deployments (unless the server is
severely underpowered or over-taxed).

Also fixes admin creation to avoid root usage in the container when it
is not called for.

roles/gitea/handlers/main.yml

@@ -1,9 +1,10 @@
 - name: Add admin user
-  community.docker.docker_container_exec: 
+  community.docker.docker_container_exec:
     container: "{{ gitea_app_container_name['stdout'] }}"
     command: >
       gitea admin user create --admin --username {{ gitea_app_admin_username }} --password {{ gitea_app_admin_password }} --email {{ gitea_app_admin_email }}
-  become: yes
+    user: git
+  become: true
   listen: "no admin user"
   
 ## Register reverse proxy