travis: migrate to container-based infrastructure
travis: migrate to container-based infrastructure

MyAccInt/aem-project-archetype,khakiout/aem-project-archetype,khakiout/aem-project-archetype,khakiout/aem-project-archetype,Adobe-Marketing-Cloud/aem-project-archetype,cpilsworth/aem-project-archetype,MyAccInt/aem-project-archetype,MyAccInt/aem-project-archetype,Adobe-Marketing-Cloud/aem-project-archetype,cpilsworth/aem-project-archetype,Adobe-Marketing-Cloud/aem-project-archetype,cpilsworth/aem-project-archetype