Encoder-decoder task support

[top-sekret]

This is a draft pull request that adds support for encoder-decoder tasks, as seen at latest OI finals.

Notes:

• Currently, the decoder could get the encoder input just by opening a file with the correct name. This will be addressed.
• Lacks unit tests.

Also see sio2project/oioioi#191.

[top-sekret]

I have addressed the security issue and rebased this branch. I now mark it as ready for review, as we may come up with unit tests during the review process.

[top-sekret]

Also note that this pull request can be merged before the OIOIOI one, because it does not alter any visible behavior. The converse is of course not true.

[twalen]

is this needed? we don't support python 2.x anymore.

[top-sekret]

This is most probably unneeded and is an artifact of trying to merge these changes with an older Python 2 codebase, used in Szkopuł. I am for removing this.

[top-sekret]

I really wish this could be made to work. However, I am being stopped by what I think is a sio2jail bug.

[MasloMaslane]

I think it's because Github runners don't give access to perf counters. But recently we created our own runner that can use sio2jail.

[top-sekret]

I think it's because Github runners don't give access to perf counters. But recently we created our own runner that can use sio2jail.

I mean they won't even run locally.

[otargowski]

I'm not sure whether this comment even has sense.

I would guess that the docker images on macOS don't have the static linking issues like the base OS.

[top-sekret]

I would guess that we don't care about crap macOS in workers.

[top-sekret]

Okay, I'm out of patience. The tests do work. However, the CI is absolute crap and can't even set up Python.

I am reverting (actually rebasing out to get rid of the mess) all CI related commits. I will be running the tests on docker.io/library/python:3.9 and docker.io/library/debian:bookworm manually to ensure that the changes work.