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 34 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #193
s390x docker-alpine
build-s390x

00:00:34

passed #194
x86_64 docker-alpine
build-x86_64

00:00:24