Fix Maven URL in startup-script.sh (#717)
Fix Maven URL in startup-script.sh (#717)

Per this post: https://central.sonatype.org/articles/2019/Jul/15/central-http-deprecation-update/

http://central.maven.org is no longer supportd. https://repo1.maven.org (note the https requirement) will continue to be supported. I ran into this while setting up my own GCP project and have confirmed that the script works with this change (see https://github.com/jalexanderqed/gcloud-website/blob/master/scripts/startup-script.sh).
GoogleCloudPlatform/getting-started-java,GoogleCloudPlatform/getting-started-java,GoogleCloudPlatform/getting-started-java