Add Admission Controller Support

[jonathan-mayer]

Issue

Currently there is no admission controller support.

Problem to solve

We need to implement a way to use an admission controller

Further details

Proposal

Find out what the admission controller does in the py-kube-downscaler and implement it in the GoKubeDownscaler.

Who can address the issue

Go Dev, preferably one who knows how admission controllers work and what it does in py-kube-downscaler

Other links/references

[samuel-esp]

Assign it to me, I'll try to work on it after label matching with regex

[jonathan-mayer]

Perfect, but label matching with regex is actually done already.

[samuel-esp]

Perfect Jonathan! Didn't know that, even better then!