[Package Request] Mattermost

[Progi1984]

Description: All team communication in one place, searchable and accessible anywhere
Website: http:https://mattermost.org
Documentation: http:https://docs.mattermost.com/
Build/Installation documentation: http:https://docs.mattermost.com/#install-guides
Source Code: https://github.com/mattermost/platform
License: MIT license

@mattermost

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[hgy59]

By examination to build mattermost-server from source I found the following requirements for the build environment:

1. node
2. npm
3. go
4. docker

I added native/nodejs (includes node and npm) and we already have native/go.
But to have docker we would need docker in docker and that is definitely out of scope here 😞.

Instead of having mattermost as a package, there is a good solution to use the mattermost docker image (limitted to models with intel cpus).