aports/scripts: Make it possible to build ARM from other architecture

5 jobs for !1774 with mkimage-arm in 2 minutes and 35 seconds (queued for 1 second)
latest detached
Status Job ID Name Coverage
  Lint
passed #18875
docker-alpine x86_64
lint

00:01:33

 
  Build
passed #18879
docker-alpine ci-build ppc64le
build-ppc64le

00:00:31

passed #18878
docker-alpine ci-build s390x
build-s390x

00:01:02

passed #18877
docker-alpine ci-build x86
build-x86

00:00:26

passed #18876
docker-alpine ci-build x86_64
build-x86_64

00:00:30