Release 2.6.0

terranix 2.6.0 adds tfRef, refactors tests, pins nixpkgs, and improves type error messages.

Version 2.6.0 is released.

Thanks to mdarocha, blaggacao and Ninlives for your input on this release.

Changelog #

• Add tfRef function to create terraform references.
• refactor tests
• pin nixpkgs due to different nixpkgs versions
• make nix flake check not complain anymore
• improve error message for types