v0.17.30

Changes

packaging: use latest label in Dockerfile (#2554)
Dependabot fails to update registry.opensource.zalan.do/library/alpine-3 base image hash,
see dependabot/dependabot-core#7387
This change removes image hash and re-introduces latest label.
For multiarch and ghcr.io builds base image is specified via BASE_IMAGE build argument and also uses latest label.
Followup on #2546

Multiarch Docker image

Multiarch Docker image is available in Github's docker registry:

docker run -it ghcr.io/zalando/skipper:v0.17.30 skipper --help

Docker image

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

docker run -it registry.opensource.zalan.do/teapot/skipper:v0.17.30 skipper --help