Use latest docker-dind/docker-builder tags for build jobs

Dan Notesteinrequested to merge
fix/docker-image-tag-defaults into develop

Summary

  • Build jobs were using $CI_COMMIT_SHA as the image tag for docker-dind/docker-builder
  • When build_docker_dind_image is skipped (because Dockerfile.docker-dind wasn't changed), jobs fail trying to pull non-existent images
  • Fixed by setting DOCKER_DIND_TAG and DOCKER_BUILDER_TAG to "latest" for all build jobs that don't depend on fresh docker builds

Test plan

  • Pipeline on this branch should pass
  • Verify that bw_emsdk_update branch works after rebasing onto this fix

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