Replace TravisCI for testing

[peterjc]

Probably will use Github Actions, look at IUC https://github.com/galaxyproject/tools-iuc/blob/master/.github/workflows/pr.yaml

[bernt-matthias]

https://github.com/galaxyproject/galaxy-tool-repository-template

[bernt-matthias]

Hopefully soon with galaxyproject/tools-iuc#4830