CI: Fast multidimensional Interop tests

[MarcoPolo]

Runs the current branch against other supported versions. Tests all transport, muxer, and security combinations. Tests dialing and listening. Runs in <10 min compared to the existing interop test of ~30 min (but effectively ~15min since there are two tests that run in parallel).

In total this currently runs 95 integration tests compared to the 2 testground tests. To be fair the testground test run a test where all different nodes are on the same network and try to ping each other. That would be equivalent to roughly 5-15 tests here.

Draft until the corresponding test-plans PR is merged: libp2p/test-plans#99

[marten-seemann]

Nice work! Mostly nits here.

I'm wondering if we can use Docker tags instead of capturing the container ID, that might simplify the build process a tiny bit.

[marten-seemann]

Should this use master?

[MarcoPolo]

This needs the branch that's in review. It will be master once that's merged.

[marten-seemann]

Does this need to be a separate module? These replace statements have proven to be incredibly painful in the past (when you update a dependency, you also have to run go mod tidy here, otherwise CI fill fail your build).

[MarcoPolo]

Doesn't have to be a separate module. Although if this isn't a separate module, then the test dependencies bubble up to the main module. So Redis would show up as a dependency to go-libp2p, even though it's only used for this test.

Unless, I'm wrong about that. In which case I'll happily not have this be a separate module.

[marten-seemann]

So Redis would show up as a dependency to go-libp2p, even though it's only used for this test.

Yeah, let's avoid that.

[marten-seemann]

We can (later) add a pre-commit git hook that checks that the go.mod here is up to date.

[marten-seemann]

LGTM. Please merge the test-plans PR first, and update the ref to master here.