v0.12.3

Changes

Unifies filter template placeholder resolution (#1528)
Introduces eskip.template.ApplyRequestContext and eskip.template.ApplyResponseContext functions and uses them for template
placeholder resolution in (set|append)(Request|Response)Header, (set|drop)Query and setPath filters.
Removes placeholder resolution from state bag in header filters, see
#1528 (comment)

Docker image

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

docker run -it registry.opensource.zalan.do/teapot/skipper:v0.12.3 skipper --help
# arm64
docker run -it registry.opensource.zalan.do/teapot/skipper-arm64:v0.12.3 skipper --help
# arm v7 32bit
docker run -it registry.opensource.zalan.do/teapot/skipper-armv7:v0.12.3 skipper --help