workspace: use direnv instead of corepack

flake.nix

@@ -1,26 +1,44 @@
 {
   description = "Hydro development environment";
 
-  inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
-  };
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
 
-  outputs = { self, nixpkgs }: 
-    let
-      system = "x86_64-linux";
-      pkgs = nixpkgs.legacyPackages.${system};
-    in {
-      packages.${system}.default = pkgs.hello;
-      devShells.${system}.default = pkgs.mkShell {
-        buildInputs = [
-          pkgs.nodejs
-          pkgs.yarn-berry
-          pkgs.pm2
-          pkgs.git
-          pkgs.gcc
-          pkgs.go-judge
-          pkgs.mongodb-ce
-        ];
-      };
-    };
-} 
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+        composeConfig = {
+          version = "0.5";
+          processes = {
+            hydro = {
+              command = "${pkgs.nodejs}/bin/node node_modules/.bin/hydrooj --debug --port=2333";
+              is_interactive = true;
+            };
+            go-judge = {
+              command = "${pkgs.go-judge}/bin/go-judge";
+            };
+            webpack = {
+              command = "${pkgs.yarn-berry}/bin/yarn build:ui:dev";
+            };
+          };
+        };
+      in
+      {
+        apps.default = {
+          type = "app";
+          program = "${pkgs.writeShellScript "compose.sh" ''
+            ${pkgs.process-compose}/bin/process-compose -f ${pkgs.writeText "process-compose.yml" (builtins.toJSON composeConfig)}
+          ''}";
+        };
+
+        devShells.default = pkgs.mkShell {
+          buildInputs = with pkgs; [
+            nodejs
+            yarn-berry
+            gcc
+            go-judge
+          ];
+        };
+      });
+}