add sqlite MaxOpenConns to 1 for fixing database locking

[lunny]

see https://github.com/mattn/go-sqlite3#faq
ref: #2040 (comment)

[techknowlogick]

This might not work because even if max connections is set to 1, multiple processes will still try to connect to DB (for example gitea serv via SSH) and they will all need one connection per process.

[sapk]

The solution could be to use the gitea api in gitea serv in place of accessing the database directly ?

[lunny]

@techknowlogick @sapk that's why we have /internal/ routes but I haven't moved all the requests.

[techknowlogick]

@lunny that makes sense.

[sapk]

I could try to migrate serv to /internal and not use the models/database access.

[jonasfranz]

I've tried this a time ago and it resulted in random errors like the server hanging up.

[lafriks]

I think this should be closed in favor of #4886

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs during the next 2 months. Thank you for your contributions.

[techknowlogick]

Closing as SQLite locking has mostly been resolved in other PRs