chore: adds nix and nixflakes environment

[cristianoliveira]

Hello there 👋

While reviewing this PR: NixOS/nixpkgs#402453 I wanted to test some stuff and for that I added the nix development in the project :)

Once this is merged one can install it using

nix profile install 'github:opencode-ai/opencode'

[kujtimiihoxha]

@cristianoliveira thanks for the PR, I am zero familiar with nix 😓 so checking if @thdxr has any experience. One thing I noticed is that the version is hard coded to 0.0.34, we use the scripts/release to tag a release and than GH actions automatically release. I am wondering if there is a way to automate this here too.

[cristianoliveira]

No worries! I just wanted to contribute back, since I'll be using the tool :D

Regarding the auto release, the challenge is that we need to regenerate the hashes based on a commit from the repo. So probably the way to go is that we can have a github action that automatically creates a PR with the new version and generates the hashes after a release. Does that make sense?

[kujtimiihoxha]

So what if we just push to main with the changes instead of a PR since it should not be able to break anything right?

[cristianoliveira]

That also can work! Just a bit more YOLO hehe

Here how I do in my projects to generate hashes automatically: https://github.com/cristianoliveira/funzzy/blob/master/scripts/bump-nix-default

There might be a more elegant way to do it