Fix missing escaping on `$DOCKER_HUB_AUTH`
Fix missing escaping on `$DOCKER_HUB_AUTH`
holmesjr/elastic-ci-stack-for-aws,buildkite/elastic-ci-stack-for-aws,caremonkey/buildkite-aws-elastic-stack,caremonkey/buildkite-aws-elastic-stack,holmesjr/elastic-ci-stack-for-aws