Modify Database Existence Check in entrypoint.sh

[sebtiz13]

In the current implementation, when using a PostgreSQL database, most Docker containers create the database and the associated user role. This leads to the DATABASE_EXISTS test in entrypoint.sh always evaluating to true, causing Wallabag to not be installed properly.

To address this issue, I propose modifying the test to check if the tables exist instead of just checking if the database exists.

Changes

1. DATABASE_EXISTS only handle the database and role creation
2. Add the TABLES_EXISTS test in entrypoint.sh to check if the tables exist.
3. If tables not exists run install_wallabag function

Testing

• Tested with PostgreSQL database.
• Verified that Wallabag is installed properly after the changes.

Related Issues

#412