Maximilian Bosch 8bf1e138bc nixos/postgresql: fix merging of shared_preload_libraries option ...

Closes #386804

The issue with coercing to `types.str` is that it's not mergeable, so
any declarations will result in an eval error like this:

    error: The option `interactive.nodes.tmp.services.postgresql.settings.shared_preload_libraries' has conflicting definition values:
    - In `/home/ma27/Projects/nixpkgs-hack/tmp.nix@node-tmp': "foo"
    - In `/home/ma27/Projects/nixpkgs-hack/tmp.nix@node-tmp': "bar2"
    Use `lib.mkForce value` or `lib.mkDefault value` to change the priority on any of these definitions.

Using a mergeable type (`types.comma`, i.e. a string, where all declarations
get joined with a comma as delimiter) fixes the problem.

2025-03-10 18:07:44 +01:00

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