testing/apt-dater: fix perms

Make sure we have sane perms on /etc /var/cache and /var/lib after
installing this package :-)

Also add a missing runtime dependency on util-linux, as screen is needed
for session recordning that is default enabled in the now shipped apt-dater.xml
config file.
7 jobs for !8121 with apt-dater-fix-perms in 1 minute and 41 seconds
detached
Status Job ID Name Coverage
  Lint
passed #121979
docker-alpine x86_64
lint

00:00:27

 
  Build
passed #121984
docker-alpine ci-build aarch64
build-aarch64

00:00:50

passed #121985
docker-alpine ci-build armv7
build-armv7

00:01:06

passed #121983
docker-alpine ci-build ppc64le
build-ppc64le

00:01:14

passed #121982
docker-alpine ci-build s390x
build-s390x

00:00:37

passed #121981
docker-alpine ci-build x86
build-x86

00:00:43

passed #121980
docker-alpine ci-build x86_64
build-x86_64

00:00:43