v0.13.87

Changes

Fixes TestBreakerLeak test (#1825)
The test uses Tee predicate that is not registered by the test proxy
constructor method newTestProxyWithFiltersAndParams which leads to
the request loop.
To make the problem apparent testlogger needs to be unmuted:

2021/08/10 10:38:46 failed to process route (shadow): predicate not found: 'Tee'
2021/08/10 10:38:46 context: failed to execute loopback request: max loopbacks reached

Followup on #1816

Docker image

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

docker run -it registry.opensource.zalan.do/teapot/skipper:v0.13.87 skipper --help
# arm64
docker run -it registry.opensource.zalan.do/teapot/skipper-arm64:v0.13.87 skipper --help
# arm v7 32bit
docker run -it registry.opensource.zalan.do/teapot/skipper-armv7:v0.13.87 skipper --help