Monkey-patch pretty-bad-protocol to work with Focal gnupg

[rmol]

Status

Ready for review

Description of Changes

Fixes #5592.

To work with recent gnupg, the pretty-bad-protocol package needs an update it seems unlikely to get, so we're gonna monkey-patch it until we can find a viable replacement.

isislovecruft/python-gnupg#250

Testing

• CI should be green.
• make test-focal should pass.
• In the source interface, submit a message and a file.
• Confirm that you can download those from the journalist interface and decrypt them.
• Send a reply to the source, and confirm that it's readable in the source interface.

Deployment

This modifies the unmaintained library we're using for encrypting submissions and replies so that it will work on Focal. It shouldn't negatively affect Xenial.

Checklist

If you made changes to the server application code:

• Linting (make lint) and tests (make test) pass in the development container

If you made non-trivial code changes:

• I have written a test plan and validated it for this PR

Choose one of the following:

• I have opened a PR in the docs repo for these changes, or will do so later
• I would appreciate help with the documentation
• These changes do not require documentation

[kushaldas]

This is 🪄🪄🪄🪄

Testing

• CI should be green.
• make test-focal should pass.
• In the source interface, submit a message and a file.
• Confirm that you can download those from the journalist interface and decrypt them.
• Send a reply to the source, and confirm that it's readable in the source interface.

Thank you @rmol for this. Focal has green CI.

Here 23 means 23 :: The key is compliant with compliance mode "de-vs". and de-vs is a German standard to handle secret information https://de.wikipedia.org/wiki/Verschlusssache.