Added docker environment

roles/iohk.nix

@@ -12,4 +12,24 @@
     "hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ="
   ];
 
+  imports = [
+    ./crystal0.32.nix
+  ];
+
+  # Set the system-wide environment
+  environment = {
+    systemPackages = with pkgs; [
+      #crystal          # A compiled language with Ruby like syntax and type inference
+      docker           # Pack, ship and run any application as a lightweight container
+      gnupg            # GNU Privacy Guard, a GPL OpenPGP implementation
+      go-jira          # Simple command line client for Atlassian's Jira service written in Go
+      icr              # Interactive console for the Crystal programming languag
+      jq               # A lightweight and flexible command-line JSON processor
+      scry             # Code analysis server for the Crystal programming language
+      shards           # Dependency manager for the Crystal language
+    ];
+  };
+
+  virtualisation.docker.enable = true;
+
 }