This patch fixes the mastodon ingress rule, that was "corrected" to
follow the official docs, but uses the `exact` match rule, instead of
the `Prefix` rule, resulting in breaking the mastodon webinterface while
fixing other clients.

This patch adjusts the dashboard to function as expected and provide the
info regarding multiple, different runners in one overview.

With different traffic policies and alike, the shared loadbalancer
causes more problems than it resolves. The original reason was that both
remote addresses would point to the same address, but this is a
non-issue given it all runs through a remote anyway.

This patch re-unifies the build pipelines for images including kOS to use
a central CI definition instead of a specific one for kOS.

This patch drops kaniko from the container building toolchain, after more
problems with paths in the koolbox image.