event gateway
docker run --rm -it -p 2113:2113 -p 1113:1113 eventstore/eventstore:20.10.2-buster-slim --insecure --run-projections=All --enable-external-tcp --enable-atom-pub-over-http
curl -v "http://localhost:8080" -X POST -H "Ce-Id: 1" -H "Ce-Specversion: 1.0" -H "Ce-Type: greeting" -H "Ce-Source: not-sendoff" -H "Content-Type: application/json" -d '{"msg":"Hello Knative!"}'