Docker base image

[Giannis Mouchakis]

Semagrow docker uses tomcat:8.5-jre8-alpine as its base image. Alpine uses musl and we should test its performance in comparison with glibc based images such as tomcat/8.5-jre8-slim which is bigger (alpine 106MB, slim 223MB) but maybe outperforms Alpine. Performance is more important for semagrow than disk space used especially if the difference is in MBs.

[Angelos Charalambidis]

Great idea! We could also stress-test both Docker images using semagrow/kobe

[Antonis Troumpoukis]

I compared both images using the fedbench queries and I got similar query execution times.