merge: dockerfile: enable x86

See merge request !4
7 jobs for master in 1 minute and 19 seconds (queued for 9 seconds)
Status Job ID Name Coverage
  Build
passed #458
s390x docker-alpine
build-s390x

00:00:22

passed #460
x86 docker-alpine
build-x86

00:00:17

passed #459
x86_64 docker-alpine
build-x86_64

00:00:23

 
  Upload
passed #461
s390x docker-alpine
upload-s390x

00:00:25

passed #463
x86 docker-alpine
upload-x86

00:00:28

passed #462
x86_64 docker-alpine
upload-x86_64

00:00:29

 
  Manifest
passed #464
docker-alpine
create-manifest

00:00:26