Ensure Ubuntu (Unix) Compatibility for Contributors

[zeljkoX]

We need to verify that the service works seamlessly on Ubuntu (or similar Unix environments), specifically from a contributor experience perspective. Most of the current development has been done on macOS, and we want to ensure:

• The project compiles successfully on Ubuntu.
• Developer tooling such as pre-commit hooks, OpenSSL/Cargo dependencies, and other system-level requirements behave as expected.

This helps avoid friction for new contributors (especially Linux users) when raising PRs or running development workflows locally.

What to Test:

Clone the repository on a clean Ubuntu machine;

• Run cargo build and ensure there are no OpenSSL or toolchain-related issues;
• Install and run pre-commit hooks;
• Validate whether any pre-commit hooks fail unexpectedly (e.g. line endings, formatters, etc);
• Check for any missing dependencies that should be added to README.md or a setup script.

Suggested Fixes

• Update the documentation (CONTRIBUTING.md or README.md) with required setup steps.
• Create a .sh or .md file listing all Ubuntu-specific setup instructions.
• Consider adjusting the pre-commit config or adding OS-specific guidance.