add nix dev shell

flake.nix

@@ -0,0 +1,36 @@
+{
+  description = "A very basic flake";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }: let
+    supportedSystems = ["x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin"];
+    forEachSupportedSystem = f:
+      nixpkgs.lib.genAttrs supportedSystems (system:
+        f {
+          pkgs = import nixpkgs {
+            inherit system;
+          };
+        });
+  in {
+    devShells = forEachSupportedSystem ({pkgs}: {
+      default = pkgs.mkShell {
+        nativeBuildInputs = with pkgs; [
+          go
+          gopls
+          deltachat-rpc-server
+        ];
+      };
+      # not core included, for when you want to set it to a local core checkout via $PATH
+      # you can start this with `nix develop .#no_core`
+      no_core = pkgs.mkShell {
+        nativeBuildInputs = with pkgs; [
+          go
+          gopls
+        ];
+      };
+    });
+  };
+}

scripts/run_tests.sh

@@ -1,4 +1,4 @@
-#!/bin/env bash
+#!/usr/bin/env bash
 
 echo "Checking code with gofmt..."
 OUTPUT=`gofmt -d .`