outputs: rework the test to run outside the shell

Author: sandydoo

tests/outputs/.test-config.yml

@@ -0,0 +1 @@
+use_shell: false

tests/outputs/.test.sh

@@ -0,0 +1,7 @@
+#!/usr/bin/env bash
+
+set -x
+
+devenv build | grep -E '(myapp1|git|myapp2|hello)'
+
+devenv build myapp2.package | grep myapp2

tests/outputs/devenv.nix

@@ -14,10 +14,6 @@
     };
   };
   config = {
-    enterTest = ''
-      devenv build | grep -E '(myapp1|git|myapp2|hello)'
-      devenv build myapp2.package | grep myapp2
-    '';
     outputs = {
       myproject.git = pkgs.git;
       hello = pkgs.hello;