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ci: optimistically build docker images alongside e2e tests

Administrator requested to merge ci-optimistically-build into master

Created by: ggilmore

Screen Shot 2019-12-16 at 12 18 22 PM

Ultimately, the purpose of our e2e tests is to prevent bad commits from making their way into the final sourcegraph/* insiders/semver docker images. Currently, we wait for all of the e2e tests to pass before we even start the process of building our docker images.

If all we care about is making sure only the commits that pass e2e test are the ones with the vetted insiders or semver tags, we can recover a lot of previously wasted time by building candidate versions of our docker images while the e2e tests are running. Once we know that e2e tests have passed, we can re-tag those candidate images with the final insiders/semver tag.

Removing the e2e tests from the critical path can potentially shave off ~5 minutes from our master branch CI pipeline.

The best buildkite builds to review for this PR are the ones for the master-dry-run/ggilmore branch which includes all of the docker build steps that the master branch has.

Note: https://github.com/sourcegraph/infrastructure/pull/1754/ would be nice to get working since this will introduce a lot more steps per build into our CI pipeline.

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