I was trying to backup my TeslaMate instance, and tried using the command given in the documentation. I kept getting this error:
```
pg_dump: error: connection to database "teslamate" failed: FATAL: role "teslamate" does not exist
```
However when I was setting up TeslaMate with [this guide](https://docs.teslamate.org/docs/guides/traefik), I changed the values in the `.env` file, specifically `TM_DB_USER`. Since I changed that, I needed to change it in the backup command also.
I added another little note box for others in this scenario.
* using ubuntu-latest instead of ubuntu-18.04
* appending -alpine to postgres
on workflow and in documentations
* Revert "using ubuntu-latest instead of ubuntu-18.04"
This reverts commit 7f84b1c99a.
Co-authored-by: Adrian Kumpf <8999358+adriankumpf@users.noreply.github.com>
