chore(ci): integrate yamllint and alejandra linters

[jbcaron]

Pull Request type

Please add the labels corresponding to the type of changes your PR introduces:

• Code style update (formatting, renaming)
• Build-related changes

What is the current behavior?

Currently, YAML files are only validated through Prettier, which primarily focuses on basic formatting. This limited approach may miss YAML-specific syntax issues and doesn't enforce consistent YAML style guidelines. Additionally, there is no dedicated linting for Nix files in the repository.

Resolves: #NA

What is the new behavior?

• Add yamllint to validate YAML files syntax and formatting
• Add Alejandra to enforce consistent Nix files formatting
• Include configuration files (.yamllint.yml)
• Integrate both linters into the existing CI pipeline
• Keep existing Prettier configuration and checks in place

Does this introduce a breaking change?

No

Other information

This PR is part of our ongoing effort to improve code quality and consistency across the codebase. The linting rules have been configured to be strict enough to catch common issues while remaining flexible enough to not impede development workflow.

To test locally:

# For YAML files
pip install yamllint
yamllint -c .yamllint.yml .

# For Nix files
nix-shell -p alejandra
alejandra --check .

[Trantorian1]

Perhaps it is worth updating scripts/madara as it has a lint command which lints the project.

[Trantorian1]

Can we enforce some kind of spacing between sections for his kind of file?

[Mohiiit]

maybe we can keep empty lines in yaml? wdyt?

[Mohiiit]

Suggest keeping line breaks between YAML sections as it follows standard formatting practices and improves readability.