example docker compose up command

README.md

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 We also provide a docker compose file to use to run piper locally. There are a few edits to the [.env](.env) to make it run smoother in a container
 `SERVER_HOST`- `0.0.0.0`
 `DB_PATH` = `/db/piper.db` to persist your piper db through container restarts
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+Make sure you have docker and docker compose installed, then you can run piper with `docker compose up`