Add Keycloak

[johnhamelink]

Implement Keycloak service based on the devenv implementation. Feedback very much appreciated - this is my first time contributing to services-flake!

TODOs:

• Running Keycloak Service
• Working Readiness Check
• Passing test
• Realm import
• Realm export
• Rigorous user testing
• Fix all outstanding FIXMEs/TODOs in comments

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Questions:

1. The devenv implementation comes with a series of scripts: how should I implement them in services-flake?
2. The devenv implementation also runs a script after termination of the service. I'm also unsure how to implement this?

[johnhamelink]

I've been using this to work on a project for a while now and it seems to work well for me!

[shivaraj-bh]

The devenv implementation comes with a series of scripts: how should I implement them in services-flake?

We don’t export scripts in services-flake. it’d be nice to add documentation for how users can define their own scripts by reading the values for the keycloak service’s options. Happy to help with this if it isn’t clear.

The devenv implementation also runs a script after termination of the service. I'm also unsure how to implement this?

process-compose supports depends_on for defining any process that should run conditional to the state of some other process. Example:

services-flake/nix/services/minio.nix

Line 122 in 6847001

depends_on."${name}-init".condition = "process_completed_successfully";

. I haven’t checked what exactly the script in the devenv service does, i will do that once I sit to review the PR thoroughly.