message: manually pin a docker version for cache reasons
diff: @@ -107,7 +107,9 @@ def doDockerBuild(String flavor, Boolean withCoverage, Boolean enableSync, Strin
  if (enableSync) {
  // stitch images are auto-published every day to our CI
  // see https://github.com/realm/ci/tree/master/realm/docker/mongodb-realm
  - withRealmCloud(version: 'latest', appsToImport: ['auth-integration-tests': "${env.WORKSPACE}/tests/mongodb"]) { networkName ->
  + // we refrain from using "latest" here to optimise docker pull cost due to a new image being built every day
  + // if there's really a new feature you need from the latest stitch, upgrade this manually
  + withRealmCloud(version: '2020-03-23', appsToImport: ['auth-integration-tests': "${env.WORKSPACE}/tests/mongodb"]) { networkName ->
  buildSteps("--network=${networkName}")
  }
  } else {
  