Nix for CI/Dev env/Docker sample

1. install nix package manager

OSX

1. Install nix package manager
2. if in OSX you need to run a delegator builder: nix run nixpkgs#darwin.builder
3. add this to /etc/nix/nix.conf

build-users-group = nixbld
extra-trusted-users = dav009
builders = ssh-ng://builder@localhost aarch64-linux /etc/nix/builder_ed25519 4 - - - c3NoLWVkMjU1MTkgQUFBQUMzTnphQzFsWkRJMU5URTVBQUFBSUpCV2N4Yi9CbGFxdDFhdU90RStGOFFVV3JVb3RpQzVxQkorVXVFV2RWQ2Igcm9vdEBuaXhvcwo=

• change aarch64-linux for the architecture you need

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• Build docker file: nix build .#docker