add docker and kubernetes configs

[ftsell]

I have added the docker configuration from git.mafiasi.de/mafiasi-ag/dockerfiles and kubernetes definitions from git.mafiasi.de/Server-AG/ansible to this repo itself.

Doing so enables others to use the Imagetagger in a more convenient way since it is openly documented how it can be deployed.

The changes were tested using a local minikube cluster and the production instance (imagetagger.bit-bots.de) already uses this new configuration as well.

[timonegk]

Why change USE_NGINX_IMAGE_PROVISION and ENABLE_ZIP_DOWNLOAD in settings.py.example? I think both settings were more adequate before since they are not needed or confusing when the application is run in a simple setup with ./manage.py runserver, for example to check out the software.

[ftsell]

Why change USE_NGINX_IMAGE_PROVISION and ENABLE_ZIP_DOWNLOAD in settings.py.example? I think both settings were more adequate before since they are not needed or confusing when the application is run in a simple setup with ./manage.py runserver, for example to check out the software.

Because the settings.py.example is now used as the in-docker default settings so that it more accurately reflects a working example an not some long-dead unmaintained file. I also think that by including a Dockerfile the simplest setup would be a docker run and not via manage.py

[ftsell]

@timonegk I have added some changes to respect your suggestions in f413c16