v0.15.1

Changes

swarm nil pointer dereference panic (#2198)
In case the Swarm is not operative, an error is logged.
However, that error is only logged and proceeded unverified.
This leads eventually into a panic of a nil pointer dereference.

Docker image

Docker image is available in Zalando's Open Source registry:

docker run -it registry.opensource.zalan.do/teapot/skipper:v0.15.1 skipper --help
# arm64
docker run -it registry.opensource.zalan.do/teapot/skipper-arm64:v0.15.1 skipper --help
# arm v7 32bit
docker run -it registry.opensource.zalan.do/teapot/skipper-armv7:v0.15.1 skipper --help