add container docs

docs/container.md

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+# Required variables
+These variables are required. Example values included. Some general variables might also be required for this role.
+
+```
+docker_service: gitea
+docker_image: gitea/gitea:latest
+
+ports:
+  gitea:
+    http: 8080 # ports[docker_service].http (or https) needed for reverse proxy
+
+```
+
+# Variables for http reverse proxy
+
+```
+reverse_proxy_type: caddy # Defaults to caddy, set to none if no reverse proxy is needed. Supported values: none, caddy, traefik
+docker_image_http_port: 3000 # the port used inside the container for http
+
+docker_vhost_domains: 
+  gitea:
+    - git.domain.tld
+
+
+```
+
+# Other optional variables
+
+```
+docker_database: postgres # Database to set up in a separate container, supports postgres and mongo
+database_passwords: # Needed for postgres
+  gitea: secret
+
+docker_volumes:
+  - gitea_data:/data
+  - /var/lib/gitea/.ssh:/data/git/.ssh
+docker_published_ports:
+  - "127.0.0.1:{{ ports.gitea.ssh }}:22"
+docker_env:
+  USER_UID: 2132
+  GITEA__database__DB_TYPE: postgres
+
+docker_network_mode: host # Usually you don't want to define this
+
+```