Add ca-certificates to docker-8000 (elastic#145)

Add 2nd Dockerfile for port 8000 (elastic#144)

Bump package to 0.4.2 (elastic#143)

Fix version extraction in buildkite pipeline

Add information on the /ping endpoint to README

Bump to 0.3.1 (elastic#123)

Push latest tag whenever a new Docker image is built (elastic#117)

Bump to 0.2.0 (elastic#83)

0.1.0 release