Add travis minimal configuration (#6056)

Fixes #4373

Author: eddumelendez

docs/supported_docker_environment/continuous_integration/travis.md

@@ -1,3 +1,15 @@
 # Travis
 
-> TODO
+To run Testcontainers on TravisCI, docker needs to be installed. The configuration below
+is the minimal required config.
+
+```yaml
+language: java
+jdk:
+- openjdk8
+
+services:
+- docker
+
+script: ./mvnw verify
+```

mkdocs.yml

@@ -100,6 +100,7 @@ nav:
                 - supported_docker_environment/continuous_integration/gitlab_ci.md
                 - supported_docker_environment/continuous_integration/bitbucket_pipelines.md
                 - supported_docker_environment/continuous_integration/tekton.md
+                - supported_docker_environment/continuous_integration/travis.md
           - supported_docker_environment/windows.md
           - supported_docker_environment/logging_config.md
           - supported_docker_environment/image_registry_rate_limiting.md