Add optional header auth information from .env

[silky]

Description

This allows for the configuration of additional header information in a .env file (also take the occasion to update the .gitignore to include exclude some Nix files)

Checklist

• [ ] Dependencies install correctly in a clean environment and code executes;
• [ ] Test coverage extended; created tests fail without the change (if possible);
• [ ] All tests passing;
• [ ] Commits follow a type convention (e.g. https://gist.github.com/brianclements/841ea7bffdb01346392c#type);
• [ ] Extended the README, documentation and/or docstrings, if necessary;

[vercel[bot]]

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