main/util-linux: remove ruby transitive dependency on bootstrap

asciidoctor depends on ruby, so we disable asciidoc during bootstrap to
limit the amount of dependencies that need to be built.
8 jobs for !26399 with main-bootstrap-limit-deps in 74 minutes and 8 seconds (queued for 3 seconds)
detached
Status Job ID Name Coverage
  Lint
failed #511729
docker-alpine x86_64 allowed to fail
lint

00:00:22

 
  Build
passed #511734
docker-alpine ci-build aarch64
build-aarch64

00:23:18

passed #511736
docker-alpine ci-build armhf
build-armhf

00:19:50

passed #511735
docker-alpine ci-build armv7
build-armv7

00:19:49

passed #511733
docker-alpine ci-build ppc64le
build-ppc64le

00:17:09

passed #511732
docker-alpine ci-build s390x
build-s390x

00:14:07

passed #511731
docker-alpine ci-build x86
build-x86

00:11:43

passed #511730
docker-alpine ci-build x86_64
build-x86_64

00:09:25

 
Name Stage Failure
failed
lint Lint

======================================================
apkbuild-lint:
======================================================



Cleaning up file based variables
ERROR: Failed to cleanup volumes
ERROR: Job failed: exit code 1