Use Docker multistage builds (#44)
Use Docker multistage builds (#44)

* Remove -ignore flag from Makefile

staticcheck no longer supports -ignore flag since release 2019.1

See:
http://staticcheck.io/changes/2019.1
https://staticcheck.io/docs/#ignoring-problems

* Fix SIGSEGV when log.level is empty or set to info

* Use multistage Dockerfile to build final image

* Ensure to use busybox linux amd64

alin-sinpalean/jiralert