Feature Request: Add Gogs support

[xet7]

@kubiko

Gogs integration is now available as separate project:
wekan/wekan@674d45a

It could be addition to wekan-snap like caddy is.

In general, I think that for both Docker Compose files and Snap plan is to have many additional integrations available, like Huginn, Rocket.Chat, GitLab, etc. like there is currently for wekan-mongodb and wekan-postgresql docker compose files.

For Sandstorm, integrations need to be run outside of Sandstorm using REST API, because grains are only running when someone is using them.

[xet7]

Related https://github.com/wekan/wekan-gogs