Update Dockerfile to Buildroot 2022.08

[burggraf]

Updating from Buildroot 2022.08-RC1 to Buildroot 2022.08 upgrades PostgreSQL from 14.4 to 14.5.

Fixes #29

[jgoux]

If we do this I guess we also have to rebuild the filesystem and generate a new state?

[burggraf]

Yes, you need to rebuild state and update the location of bzImage as well.

[jgoux]

Yes, you need to rebuild state and update the location of bzImage as well.

Ok, I'll do that in this PR and merge it once we have all the files. Maybe it's worth waiting for your readline experiment so I can also include it?

[burggraf]

That's a good idea. I'll let you know if readline works.

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[jgoux]

I rebuilt the filesystem and tweaked index.html a bit to be able to send background commands thanks to your inbox (to start the network). 👍

I also corrected the instructions for copying the .config back to the host, they were wrong and the /config folder wasn't mounted properly in the Dockerfile.