build: fix rhodecode-tools for docker builds

pkgs/patches/rhodecode_tools/setuptools.patch

@@ -0,0 +1,12 @@
+diff -rup rhodecode-tools-1.4.0-orig/setup.py rhodecode-tools-1.4.0/setup.py
+--- rhodecode-tools-1.4.0/setup-orig.py	2021-03-11 12:34:45.000000000 +0100
++++ rhodecode-tools-1.4.0/setup.py	2021-03-11 12:34:56.000000000 +0100
+@@ -69,7 +69,7 @@ def _get_requirements(req_filename, excl
+
+
+ # requirements extract
+-setup_requirements = ['pytest-runner']
++setup_requirements = ['pytest-runner==5.1.0']
+ install_requirements = _get_requirements(
+     'requirements.txt', exclude=['setuptools'])
+ test_requirements = _get_requirements('requirements_test.txt')

pkgs/python-packages-overrides.nix

@@ -292,6 +292,12 @@ self: super: {
     ];
   });
 
+  "rhodecode-tools" = super."rhodecode-tools".override (attrs: {
+    patches = [
+      ./patches/rhodecode_tools/setuptools.patch
+    ];
+  });
+
   # Avoid that base packages screw up the build process
   inherit (basePythonPackages)
     setuptools;