Add github actions tests (#77)

Borrowing the configuration from wsg-intercept and then editing
to fit so that we've got some automated tests.

To get this to work it was necessary to:

* adjust python versions
* update action version
* pin the ubuntu version
* fix warning in test_grantip
* form.cgi needs to not use six because it is not running in
   the virtualenv
* quiet deprecations in in form.cgi because cgi module is deprecated
* Skip the proxy test as it uses httpbin.org which is unreliable

1 files changed, 9 insertions, 2 deletions

diff --git a/tests/cgiapp_data/form.cgi b/tests/cgiapp_data/form.cgi
index c4c562d..5ad8f68 100755
--- a/tests/cgiapp_data/form.cgi
+++ b/tests/cgiapp_data/form.cgi
@@ -2,13 +2,20 @@
 
 from __future__ import print_function
 
+import sys
+
+# Quiet warnings in this CGI so that it does not upset tests.
+if not sys.warnoptions:
+    import warnings
+    warnings.simplefilter("ignore")
+
+# TODO: cgi is deprecated and will go away in Python 3.13.
 import cgi
-import six
 
 print('Content-type: text/plain')
 print('')
 
-if six.PY3:
+if sys.version_info.major >= 3:
     # Python 3: cgi.FieldStorage keeps some field names as unicode and some as
     # the repr() of byte strings, duh.