Home Assistant Add-on for Mattermost helps you deploy Mattermost as Add-on in Home-Assistant. Mattermost is an open source platform for secure collaboration across the entire software development lifecycle..
It requires external DB, Postgres or MariaDB
https://github.com/mattermost/docker
For issues, please go to the issue tracker.
The installation of this add-on is pretty straightforward and not different in comparison to installing any other Hass.io add-on.
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Add my Hass.io add-ons repository to your Hass.io instance.
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Install this add-on.
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Start the add-on.
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Check the logs of the add-on to see if everything went well.
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Open WebUI at homeassistant:8065 or use Ingress