test: make nice pytest reports on github (#2376)

* test: make nice pytest reports on github
utilizing this action: https://github.com/pavelzw/pytest-action/

flake.nix

@@ -37,6 +37,9 @@
             asgi-lifespan = prev.asgi-lifespan.overridePythonAttrs (
               old: { buildInputs = (old.buildInputs or []) ++ [ prev.setuptools ]; }
             );
+            pytest-md = prev.pytest-md.overridePythonAttrs (
+              old: { buildInputs = (old.buildInputs or []) ++ [ prev.setuptools ]; }
+            );
           });
         };
       });