keycloak: add unix socket support

[vog]

This commit adds unix socket support to keycloak via junixsocket-common and junixsoket-native-common.

This way, keycloak can be configured to connect to PostgreSQL via unix sockets instead of TCP/IP, using the JDBC URI syntax as described in the junixsocket manual: https://kohlschutter.github.io/junixsocket/dependency.html#postgresql

For the related discussion, see:

• junixsocket{,-native}-common: init at 2.10.1 #427538 (comment)

Things done

• Built on platform:
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• Tested, as applicable:
  • NixOS tests in nixos/tests.
  • Package tests at passthru.tests.
  • Tests in lib/tests or pkgs/test for functions and "core" functionality.
• Ran nixpkgs-review on this PR. See nixpkgs-review usage.
• Tested basic functionality of all binary files, usually in ./result/bin/.
• Nixpkgs Release Notes
  • Package update: when the change is major or breaking.
• NixOS Release Notes
  • Module addition: when adding a new NixOS module.
  • Module update: when the change is significant.
• Fits CONTRIBUTING.md, pkgs/README.md, maintainers/README.md and other READMEs.

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[SuperSandro2000]

LGTM

[nekowinston]

Seems like a good change. Would it make sense to also adjust the NixOS module?

nixpkgs/nixos/modules/services/web-apps/keycloak.nix

Lines 431 to 432 in 5856831

	databaseActuallyCreateLocally = cfg.database.createLocally && cfg.database.host == "localhost";
	createLocalPostgreSQL = databaseActuallyCreateLocally && cfg.database.type == "postgresql";

createLocally is a default that results in db-url-host=localhost & db-url-port=5432 without any further user config.

[vog]

Seems like a good change. Would it make sense to also adjust the NixOS module?

nixpkgs/nixos/modules/services/web-apps/keycloak.nix

Lines 431 to 432 in 5856831

	databaseActuallyCreateLocally = cfg.database.createLocally && cfg.database.host == "localhost";
	createLocalPostgreSQL = databaseActuallyCreateLocally && cfg.database.type == "postgresql";

createLocally is a default that results in db-url-host=localhost & db-url-port=5432 without any further user config.

That makes absolutely sense! However, I can't do that currently, as I have no NixOS instance running - I'm using Nixpkgs to create my own s6-based services on top of it.

[vog]

@SuperSandro2000 @nekowinston Since no volunteer stepped up to adjust nixpkgs/nixos/modules/services/web-apps/keycloak.nix, would you be fine with merging this PR as-is, as a pure nixpkgs improvement, and to leave the then-possible improvements to the NixOS module to a separate issue resp. PR?

[SuperSandro2000]

fine for me