docker image for remote execution without GCP/RBE

[tdyas]

Problem

The ability of the Pants project to use RBE on GCP ends soon. The image used for remote execution relies on a GCP/RBE image.

Solution

Create a similar image that does not rely on RBE/GCP.

Result

Initial testing of this image internally with Toolchain's remote execution cluster shows that many tests pass. Further iteration may be necessary if some additional dependencies are missing that would have been included in the RBE/GCP image.

[tdyas]

I'd like to publish this to the pantsbuild org on Docker Hub or another registry. I can add a script to do the applicable docker commands. Thoughts?

[tdyas]

• Also, this image adds Python 3.8 to the image and upgrades all of the Python versions to the latest patch levels.

• We could test this image using RBE before Toolchain's executor is ready to ensure that it contains all necessary dependencies. That could be done by pushing this image to a repository and then updating the container-image config in pants.remote.toml to that image (in a separate PR).

[coveralls]

Coverage remained the same at 0.0% when pulling 5065a65 on tdyas:tc_remote_execution_image into e543e33 on pantsbuild:master.

[stuhood]

Thanks a lot!