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
x86_64 docker-alpine
lint

00:01:33

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

00:00:31

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

00:01:02

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

00:00:26

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

00:00:30