add flake.nix

Author: ornicar

flake.lock

@@ -0,0 +1,34 @@
+{
+  description = "lila-ws development environment for Nix & flakes";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+  outputs = { self, ... }@inputs:
+
+    let
+      javaVersion = 25;
+      supportedSystems =
+        [ "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+      forEachSupportedSystem = f:
+        inputs.nixpkgs.lib.genAttrs supportedSystems (system:
+          f {
+            pkgs = import inputs.nixpkgs {
+              inherit system;
+              overlays = [ inputs.self.overlays.default ];
+            };
+          });
+    in {
+      overlays.default = final: prev:
+        let jdk = prev."jdk${toString javaVersion}";
+        in rec {
+
+          sbt = prev.sbt.override { jre = jdk; };
+          scala = prev.scala_3.override { jre = jdk; };
+        };
+
+      devShells = forEachSupportedSystem ({ pkgs }: {
+        default =
+          pkgs.mkShellNoCC { packages = with pkgs; [ scala sbt coursier ]; };
+      });
+    };
+}