Add basic nix dev setup

Author: eikek

flake.lock

@@ -0,0 +1,40 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11";
+    devshell-tools.url = "github:eikek/devshell-tools";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+    devshell-tools,
+  }:
+    {
+    }
+    // flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = nixpkgs.legacyPackages.${system};
+      ciPkgs = with pkgs; [
+        devshell-tools.packages.${system}.sbt17
+        jdk17
+      ];
+      devshellPkgs =
+        ciPkgs
+        ++ (with pkgs; [
+          jq
+          scala-cli
+        ]);
+    in {
+      formatter = pkgs.alejandra;
+
+      devShells = {
+        default = pkgs.mkShellNoCC {
+          buildInputs = (builtins.attrValues devshell-tools.legacyPackages.${system}.cnt-scripts) ++ devshellPkgs;
+        };
+        ci = pkgs.mkShellNoCC {
+          buildInputs = ciPkgs;
+        };
+      };
+    });
+}