Add healthcheck

pica-etherpad/Dockerfile

@@ -47,5 +47,7 @@ ENTRYPOINT ["/entrypoint.sh"]
 #Start Etherpad with supervisor
 CMD /bin/bash -c "/opt/etherpad-lite/bin/run.sh"
 
+HEALTHCHECK CMD curl -s 127.0.0.1:${ETHERPAD_PORT:=8080}
+
 EXPOSE 8080
 VOLUME /opt/etherpad-lite/var