etebase-server: add option withPostgres

[duament]

Description of changes

On current nixos-unstable branch, the following etebase-server config using postgresql backend

services.etebase-server = {
  enable = true;
  settings = {
    global.secret_file = config.sops.secrets."etebase/secret".path;
    allowed_hosts.allowed_host1 = "example.com";
    database = {
      engine = "django.db.backends.postgresql";
      name = "etesync";
      user = "etesync";
      host = "postgres.example.com";
      port = 5432;
    };
    database-options.passfile = config.sops.secrets."etebase/postgresql".path;
  };
};

fails with

Traceback (most recent call last):
  File "/nix/store/1bd23bjb8kirg6iz59j35155724qp2hk-python3.10-django-3.2.15/lib/python3.10/site-packages/django/db/backends/postgresql/base.py", line 25, in <module>
    import psycopg2 as Database
ModuleNotFoundError: No module named 'psycopg2'

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandbox = true set in nix.conf? (See Nix manual)
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 22.11 Release Notes (or backporting 22.05 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
  • (Release notes changes) Ran nixos/doc/manual/md-to-db.sh to update generated release notes
• Fits CONTRIBUTING.md.

[duament]

@felschr

[RaitoBezarius]

LGTM.

[felschr]

Shouldn't we also have an option for the package instead of adding it only in the module?
It could be done in the same way as the withLdap option with the default being true.

[duament]

@felschr Added a withPostgres option. I wonder if we still need the patch in the module?

[felschr]

I think we can remove this since withPostgres's default is true.
But I guess we could also set withPostgres to false by default and keep this.
Would be nice to have a third opinion on this.

[felschr]

Can you turn this into a single commit? Otherwise, I think it's good to merge.

[nixos-discourse]

This pull request has been mentioned on NixOS Discourse. There might be relevant details there:

https://discourse.nixos.org/t/prs-already-reviewed/2617/667