chore: add pg to api deps

[shoom3301]

typeorm library doesn't include database provider dependencies, so you need to install them by yourself.
We have pg dependency in the root package.json and it works well when you build and run the app locally, it even works if you do docker compose!

Anyway, in aws we get this error:

{"type":"DriverPackageNotInstalledError","message":"Postgres package has not been found installed. Try to install it: npm install pg --save","stack":"DriverPackageNotInstalledError: Postgres package has not been found installed. Try to install it: npm install pg

@ahhda found a key of the problem, in the container we have a package.json of /app/api which is generated by nx while building and it doesn't include pg dependency.
I assume, nx only collects dependencies that explicitly are in use in the app.
To fix that I've initialized package.json in api app and explicitly added pg dependency there.

Before:

After:

[ahhda]

Works well 👍

Would be great to also solve the root cause so that we don't have the same issue with other BFF images. Adding dependency to root package.json should be reflected in the sub projects package.json upon build.

[shoom3301]

Would be great to also solve the root cause so that we don't have the same issue with other BFF images

@ahhda I think my assumption from the PR description is right, this is just a nuance how typeorm works with db providers and how nx collects dependencies for apps.
Anyway, I will add this information to README.

[alfetopito]

👍

[alfetopito]

My only worry on this is to have another package json to keep track of