Fix geddit version in docker image reqs

See merge request !4

move to common Python pipeline

Closes #2 and #3

See merge request !3

Move to using the common CI pipeline. Add in flake8, isort and
pre-commit configuration required to support this.

This also allows publication to the GitLab package registry.

Closes #2

Closes #3

make use of geddit to fetch URLs

Closes #1

See merge request !2

This library was the basis of geddit. Move full circle and make use of
geddit for the library.

Closes #1

Initial implementation of externalsettings module

Closes uis/devops/webapp-boilerplate#48

See merge request !1

The project isn't what is being tested.

Add an implementation of externalsettings lifted from
https://gitlab.developers.cam.ac.uk/uis/devops/gsuite/g-suite-authenticator.

Closes uis/devops/webapp-boilerplate#48

Add a skeleton project which will be used just for running the
application tests. This is based on our standard webapp template with
everything not related to running tox tests stripped out.