Bazel CI Release Process should build and publish Bazel docker containers

[philwo]

The current Bazel Docker containers are being built by the RBE toolchains team, but they asked us to take this on.

We should setup some tooling and a pipeline (?) to regularly automatically build current Bazel containers for all released versions.

[kevingessner]

@philwo Hello, any news here? This is still blocking us on smoothly upgrading Bazel past 3.5.

[philwo]

@kevingessner Not yet, sorry :( But this is really important to me and I'll get to it as soon as I can, promised!

[EdSchouten]

Any updates on this?

[chasain]

I'm all for automating this, but for now can we get a manually built image pushed

[johanbrandhorst]

Friendly bump, blocking upgrade from 3.5.0

[EdSchouten]

This is still an issue.