[WIP] bazel: Set RBE downloads to minimal

[phlax]

Signed-off-by: Ryan Northey ryan@synca.io

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Additional Description:

Testing RBE locally and it can in many cases take longer downloading files than it would have done just running locally

Partly i think (mis)use of pkg_tars is to blame, and there are defo some optis that we could add, but i also think we want this set to minimal if possible i wasnt using the CI config

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Testing:
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[phlax]

this seems to make the problem described in bazelbuild/bazel#11834 worse, and prevents the workaround from working - investigating further...

[phlax]

this seems to speed up CI considerably (and local RBE)

the one gotcha is the workaround in CI - as this is kinda already the case - just the workaround has changed - im thinking we should still add

we might want to add some docs somewhere about the known issue if it affects local RBE without running through the ci codepath

one option might be to use pkg_tar and bundle the bins before downloading, in my local testing nothing seemed to prevent these downloading wherever they are in the pipeline - but potentially doing this could resolve the TODO about using bazel to build all of the release bins together

[phlax]

strange CI seems to not dl the pkg files at all - not sure why it is different locally

https://dev.azure.com/cncf/envoy/_build/results?buildId=112063&view=logs&j=d56d8cbf-a81f-59e6-8c88-0420601e1aa0&t=afdd832d-55f2-5116-86b3-7f79d03ddeb4&l=195

[phlax]

not sure why it is different locally

because im building docs and not running any tests that consume the docs output beforehand

[phlax]

because im building docs and not running any tests that consume the docs output beforehand

that doesnt seem to be it - docs fail in CI and dont run anything that consumes the docs beforehand and it is failing - locally never fails

[phlax]

so it seems the reason i was downloading so much is that i didnt have the toplevel config activated

i now also understand that download_minimal means more like download_nothing - so if this is the default then build jobs that use targets locally need to add a flag - probably if we enable this it should just be for ci

not sure exactly why but this still saves 25% from the job to build x86 - i guess this is more to do with test than build

[github-actions]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in 7 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!

[github-actions]

This pull request has been automatically marked as stale because it has not had activity in the last 30 days. It will be closed in 7 days if no further activity occurs. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!

[github-actions]

This pull request has been automatically closed because it has not had activity in the last 37 days. Please feel free to give a status update now, ping for review, or re-open when it's ready. Thank you for your contributions!