CI: Attempt to mitigate CrateDB bootstrap errors on Windows

Author: amotl

src/crate/testing/layer.py

@@ -230,6 +230,7 @@ def __init__(self,
         if crate_exec is None:
             start_script = 'crate.bat' if sys.platform == 'win32' else 'crate'
             crate_exec = os.path.join(crate_home, 'bin', start_script)
+            crate_exec += ('-Djava.net.preferIPv4Stack=true',)
         if crate_config is None:
             crate_config = os.path.join(crate_home, 'config', 'crate.yml')
         elif (os.path.isfile(crate_config) and