Make sure util_Linux gets replaced as intended

There were some discussions in #2420 whether the zypper install
commend worked as intended. While there's liitle doubt that those
packages weren't installed this PR makes really sure that this is the case.

Also it does an update via ``zypper up`` as the image provided from
dockerhub seemed to be somewhat behind.

Dockerfile

@@ -6,12 +6,20 @@ ARG INSTALL_ROOT=/rootfs
 FROM opensuse/leap:${LEAP_VERSION} as builder
 ARG CACHE_ZYPPER=/tmp/cache/zypper
 ARG INSTALL_ROOT
-# /etc/os-release provides $VERSION_ID
+
+
+# /etc/os-release provides $VERSION_ID below.
+# We don't need the openh264.repo and the non-oss repos, just costs build time (repo caches).
+# Also we need to remove the util_linux RPM to /really/ make sure busybox-util-linux gets installed.
+# And we need to update, see PR #2424
 RUN source /etc/os-release \
+  && rm -f /etc/zypp/repos.d/repo-openh264.repo /etc/zypp/repos.d/repo-non-oss.repo \
   && export ZYPPER_OPTIONS=( --releasever "${VERSION_ID}" --installroot "${INSTALL_ROOT}" --cache-dir "${CACHE_ZYPPER}" ) \
   && zypper "${ZYPPER_OPTIONS[@]}" --gpg-auto-import-keys refresh \
+  && rpm -e util-linux --nodeps \
   && zypper "${ZYPPER_OPTIONS[@]}" --non-interactive install --download-in-advance --no-recommends \
        bash procps grep gawk sed coreutils busybox-util-linux busybox-vi ldns libidn2-0 socat openssl curl \
+  && zypper up -y \
   && zypper "${ZYPPER_OPTIONS[@]}" clean --all
 ## Cleanup (reclaim approx 13 MiB):
 # None of this content should be relevant to the container: