Add docker-compose files for dependabot

[upgradingdave]

Dependabot doesn't recognize image versions in values.yaml files, but it would recognize versions inside docker-compose files.

We could experiment with creating docker-compose files so that dependabot will warn when new versions are available.

[falko]

UpdateCLI might be another solution: https://blog.promaton.com/how-to-set-up-automated-helm-chart-upgrades-e292192a9aad

[falko]

In bc28887 I removed versions from the development profile to ease the maintenance a little. But I can also imagine opinions that one should have control over which version is used in development.