solution: use gradle 7.2

Co-authored-by: Brian McGee <brian@41north.dev>

nix/default.nix

@@ -0,0 +1,45 @@
+{ system ? builtins.currentSystem
+, nixpkgs ? import ./nixpkgs.nix { inherit system; }
+}:
+let
+  mkEnv = nixpkgs.callPackage ./mkEnv.nix { };
+in
+rec {
+  inherit
+    nixpkgs
+    ;
+
+  protoc-gen-grpc-java = nixpkgs.callPackage ./pkgs/protoc-gen-grpc-java { };
+
+  env = mkEnv {
+    env = {
+      # Configure nix to use nixpgks
+      NIX_PATH = "nixpkgs=${toString nixpkgs.path}";
+      # Set the env for gradle
+      JAVA_HOME = "@env-root@/lib/openjdk";
+    };
+
+    paths = [
+      # Development tools
+      nixpkgs.gitAndTools.git-absorb
+      nixpkgs.jq
+      nixpkgs.niv
+      nixpkgs.websocat
+      nixpkgs.yq
+
+      # Protobuf stuff
+      nixpkgs.protobuf3_9
+      protoc-gen-grpc-java
+
+      # Code formatting
+      nixpkgs.treefmt
+      nixpkgs.nixpkgs-fmt
+      nixpkgs.shfmt
+
+      nixpkgs.jdk
+      nixpkgs.coreutils
+      nixpkgs.gnugrep
+      nixpkgs.which
+    ];
+  };
+}