add initial implementation of the image

This is an adoption of https://github.com/alpinelinux/alpine-drone-ci
for gitlab.
2 jobs for initial-implementation in 1 minute and 49 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #178
s390x docker-alpine
build-s390x

00:01:47

passed #179
x86_64 docker-alpine
build-x86_64

00:00:31