Bump testing and future to v22.0.0rc2

[sisuresh]

No description provided.

[willemneal]

Shouldn't the protocol version be bumped to 22?

[willemneal]

And don't we need to update soroban-rpc?

[sisuresh]

And don't we need to update soroban-rpc?

We do, but soroban-rpc hasn't been released yet.

Shouldn't the protocol version be bumped to 22?

We have to keep it at 21 for now until the soroban-rpc and horizon releases are ready.

[willemneal]

How can I use the unreleased versions? Can we use a prerelease?

[leighmcculloch]

A couple of the core builds keep failing, but the errors aren't outputted or obvious. When I test the same build locally it works fine. And after rerunning a few times one of the failures started passing, so I'll keep doing same for the moment. It's only happening on arm64 builds, and arm64 builds are intensive due to emulation, so maybe we're killing / losing the instances due to some sort of overuse.

I've got another PR in process that gets us away from using emulation for arm64 builds, I might get time to close that out and maybe that'll make the arm64 builds more reliable:

• Use arm runners #622

[leighmcculloch]

How can I use the unreleased versions? Can we use a prerelease?

@willemneal Once we get this build passing you could use the image here, but it still won't have the RPC. Once this PR merges we'll get the RPC updated in a PR and you will hopefully be able to use it straight away.