Feat. Adding the rest of the steps to get nix to the action

README.md

@@ -104,3 +104,5 @@ jobs:
           folder: "src"
           #destination: "subfolder"
 ```
+
+## 

docker_nix/action.yml

@@ -8,4 +8,12 @@ runs:
       run: |
         apt update
         apt upgrade
-        apt install sudo
+        apt install sudo
+    - uses: https://github.com/cachix/install-nix-action@v29
+      with:
+        nix_path: nixpkgs=channel:nixos-unstable
+        extra_nix_config: |
+          trusted-public-keys = skynet-cache:zMFLzcRZPhUpjXUy8SF8Cf7KGAZwo98SKrzeXvdWABo= hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
+          substituters = https://nix-cache.skynet.ie/skynet-cache https://hydra.iohk.io https://cache.nixos.org/
+    - shell: bash
+      run: nix --version