Add Rust CI

[AntoineRR]

Description

• Fix Rust clippy warnings
• Add a CI for the Rust part of the project, running cargo check, cargo test, cargo fmt, and cargo clippy

Notes

• I added more than just clippy, let me know if you want to remove some stuff
• There are two different CI systems in the project : Github Actions and Circle CI. I added the Rust CI to the Github Actions CI because that's what I am the most familiar with. Is there a reason why Circle CI is used for testing the Python part of Robyn? If you prefer having the Rust CI on Circle CI I think I can figure it out and move it there :)

This PR fixes #236

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[sansyrox]

Thank you for the contributions! :D

I have an inline comment.

[sansyrox]

@AntoineRR , are these the replacements of the circle ci?

These are cargo test and cargo check , right?

cargo test is already being done in the .circleci/config.yml file

[AntoineRR]

Thanks for your feedback :)

From what I understand of CircleCI, you indeed defined a test command in .circleci/config.yml on line 12, that would run cargo test. However, this command is currently not used in any of the workflows. To use the test command, it should be added under steps inside a job (example from the doc: the command sayhello is invoked inside the myjob job, which has to be run by a workflow). As I am not very familiar with this, I may have misunderstood something, so feel free to correct me if that's the case.

I also chose to add the commands to github workflows as it is easier to specify the CI should run on push AND on pull requests. To move cargo test, cargo fmt and cargo clippy to circle CI, I think I would just have to uncomment lines 56-57 of .circleci/config.yml to invoke the lint-test-build job defined in the rust orb :) Let me know what suits you best!

[sansyrox]

@AntoineRR , that makes sense. I anyway want to move away from CircleCI. This will be a good first step.

Thanks!

[sansyrox]

LGTM! 🚀