Bug/work around authorizenet bug

[jusdino]

Authorize.Net's python SDK, authorizenet currently has a bug that makes it uninstallable in environments that use the latest of python-maintained library management tools. Specifically, setuptools, with version 78+ stopped supporting some long-deprecated configuration arguments, which the authorizenet library still uses. In the hopes that Authorize.Net will quickly remedy this bug, we have adopted a temporary work-around to unblock our deploy pipelines: We've custom-built a docker image for building our lambdas that includes a downgraded version of setuptools.

This work-around is far from an ideal solution, so we should discuss it carefully before approving. Unfortunately, it is also the only short-term solution I can see to getting our pipeline unblocked.

Description List

• Add a Dockerfile to build a custom SAM python lambda builder image with downgraded setuptools
• Update PythonLambda to use this custom image, as hosted in a public registry we've created for the purpose

Testing List

• Code review

[jusdino]

Work-around is OBE: setuptools released another update where they postponed pulling support for the deprecated config.cfg fields. So long as authorize.net updates before 2026, we should be OK.