Add the Compose project heath check script to the image.

Oops, should have done that before.

images/docker/.dockerignore

 *
+!compose-health-check

images/docker/Dockerfile

@@ -6,3 +6,4 @@ RUN apk add --update-cache --no-cache \
         py3-dotenv \
     && \
     rm -rf /root/.cache /tmp/* /var/tmp/*
+COPY --chown=root:root compose-health-check /usr/local/bin/