feat(db): Split prod and dev db, default to dev

[boxbeam]

Closes #1272

NOTE: This will immediately present a breaking change for anyone who currently has a prod db and is expecting it to be used on startup. We might want to document this, but if so, which document(s)?

[wsxiaoys]

Please also change:

1. tabby/.github/workflows/release.yml

   Line 38 in e1312c7

   build_args: --features static-ssl

2. tabby/Dockerfile

   Line 41 in e1312c7

   cargo build --features cuda --release --package tabby && \

[wsxiaoys]

NOTE: This will immediately present a breaking change for anyone who currently has a prod db and is expecting it to be used on startup. We might want to document this, but if so, which document(s)?

It won't - since the only one we break are those running from our source code repository