feat: database deployment

[jgoux]

What kind of change does this PR introduce?

feature

What is the current behavior?

we can't deploy the local databases we create in the browser

What is the new behavior?

the databases can be deployed and accessed with any PostgreSQL client over TCP

[gregnr]

So at this point is it correct to say the only remaining things are:

1. Merging chore - fly deployment #11 into this branch
2. Come up with a way to delete old cache when we run low on space?

[jgoux]

So at this point is it correct to say the only remaining things are:

1. Merging chore - fly deployment #11 into this branch
2. Come up with a way to delete old cache when we run low on space?

Yes exactly.
I want to make it works and then address the optimizations (no volume, cache deletion, --schedule instead of cron manager).

[jgoux]

I renamed the branch to next: #71