chore: add flake

[adfaure]

PR: Add Flake for Development Environment in NixOS

Description

This PR introduces a flake to facilitate development within a NixOS environment.

To utilize this enhancement, ensure you have Nix installed with the flake feature enabled. Detailed instructions can be found here.

Once installed, navigate to the root of the project and execute nix develop. This command will drop you into a new shell equipped with the necessary Java dependency. I encountered no issues when following the command described in the contributing guide.

Additionally, this PR includes a modification to use gradle instead of gradlew in the build-images.sh script, as gradlew was not accessible in my path.

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[jevy]

Works great on my machine:

@lucapette What do you think? Only change is the gradlew in the build script but if we used this for building the images, the dependencies are already locked in flake.lock.
I can update the doc as an alternative way to getting started.

[adfaure]

Hi, I just want to draw your attention to the fact that I think that your kotlin/java dependencies are not managed by nix with this approach.

This comment gives more context. The only locked dependencies are the gradle, and the jdk stated in targetPkgs.

[lucapette]

@adfaure first of all, thank you for your work on this!

Second off, I can't comment on flake/nix as I don't actually know what they are.

As for the change in the script, I wouldn't want to do that as that's now how you'd want to use gradle in a project. The "gradle wrapper" (gradlew) is the best way to use gradle which is why it's checked in the repo.

I updated the script in #103 this morning so that the build images script uses the absolute path when calling gradle (basically removing the constraint that you have to run the build images script from the root of the repo).

[adfaure]

@lucapette I understand, I removed the gradle changes in the build script. It still works with your new script.

@jevy could you confirm please?

Regards

[lucapette]

@adfaure thank you very much for taking care of this. I will be adding notes about this in the docs after we merge