Add gitea role

Added base gitea docker setup role.

Adds automatic unattended setup with default admin account and optional
email notification setup.

roles/gitea/meta/main.yml

@@ -0,0 +1,16 @@
+---
+
+galaxy_info:
+  author: Marty Oehme
+  description: Light-weight git hosting
+  license: GPL-3.0-only
+  min_ansible_version: 2.9
+  galaxy_tags: []
+  platforms:
+    - name: GenericLinux
+      versions: all
+  
+dependencies:
+  - docker
+  - docker-swarm
+  - caddy