chore: add status badge
MODIFY
README.md
README.md
+[![Docker Image CI](https://github.com/apiman/apiman-docker/actions/workflows/docker-image.yml/badge.svg)](https://github.com/apiman/apiman-docker/actions/workflows/docker-image.yml)
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# apiman docker images
This project contains docker images for various platforms. See the README.md files in each

chore: add status badge