add nix flake & direnv support

Phileasrequested to merge
fpletz/flake into main

Adds a nix flake with the following features/enhancements:

  • builds docker image without qemu/root
  • nix develop environment with compatibility to nix-shell
  • direnv support with nix-direnv
  • ci infrastructure for docker build and caching
  • adds a nix binary cache hosted with cachix
    • pubkey: flow3r.cachix.org-1:/v8059Hm6UdEVNKE15uxltpYM0z+pulaTpobjIvFM5A=
    • currently in the cachix account of @fpletz

The new nix-deps job that runs before all other jobs takes less than one minute if nothing needs to be built in case everything is already cached.

Edited by Phileas

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