Allow ming install to fail

Author: amol-

.github/workflows/run-tests.yml

@@ -20,7 +20,7 @@ jobs:
           python -m pip install --upgrade pip
           pip install git+https://github.com/TurboGears/crank.git
           pip install git+https://github.com/TurboGears/backlash.git
-          pip install git+https://github.com/TurboGears/Ming.git
+          pip install git+https://github.com/TurboGears/Ming.git || exit 0
           pip install repoze.who
           pip install -U --upgrade-strategy=eager --pre -e .[testing]
           pip install pytest-cov