feat: create empty sqlite file if env flag is specified

[nya1]

at the moment if you start scatola with a DATABASE_URL that points to a non-existent file prisma will throw the following error

Error: P1013: The provided database string is invalid. Error parsing connection string

we should create an empty sqlite file if the DATABASE_URL is defined and CREATE_EMPTY_DATABASE is true, for example with sqlite3 this can be accomplished with sqlite3 file.db "VACUUM;"