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)
latest
Status Job ID Name Coverage
  Build
passed #193
docker-alpine s390x
build-s390x

00:00:34

passed #194
docker-alpine x86_64
build-x86_64

00:00:24