First try at implementing optionsfor allowing different manylinux1 docker images

test/06_docker_images/setup.py

@@ -0,0 +1,12 @@
+import os
+
+from setuptools import setup, Extension
+
+if os.environ.get('CIBUILDWHEEL', '0') != '1':
+    raise Exception('CIBUILDWHEEL environment variable is not set to 1')
+
+setup(
+    name="spam",
+    ext_modules=[Extension('spam', sources=['spam.c'])],
+    version="0.1.0",
+)