Add upgrade instructions to the README

[hoggatt]

Hi, thank you for making this -- it was very easy to get outline up and running!

I see that you're managing specific versions of the containers which is nice, however I'm not sure what the procedure for updating should be. It would be nice if there was a section in the README that says what do do when you've updated this project.

Maybe something like this

---

Upgrading

If there's an update, simply pull the latest version of this repo git pull ...
Then run ??? (maybe this is docker compose pull/up or maybe the upgrade process is more complex?) and you'll be using the latest versions of everything. Your data is stored/persisted in the data folder so everything should just work once the update is done.

[ssenior45]

Thank you also for making this, it's incredibly helpful.

@hoggatt to upgrade do the following:

cd outline-docker-compose
vi .env

Change the OUTLINE_VERSION value and save.

sudo make stop
. .env
sudo make update-images
sudo make start

If you update to a version >= 0.69.0 of Outline, that's all you need to do as from that version onwards database upgrades are done for you.

[hoggatt]

Thank you @ssenior45, this worked for me! I'm on version 0.71.0 now. I noticed that my postgress and minio versions are the same as before. Do I not have to worry about that or should I look into updating those at some point as well? I'm unsure if ourline is picky with versions or if it should just work with the latest.

[ssenior45]

I would just check the release notes of outline which would mention if the version you are going to requires a higher version of Postgres and/or minio. That hasn’t been the case so far.