Changes

open5gs-master: useradd: don't hardcode uid

Give the user that runs open5gs a different UID than the build user from
the debian-bookworm-build container.

Fix for:
useradd: UID 1000 is not unique

Related: OS#6057
Change-Id: I49051e038740cfccbb11ad33a1884bb7de318710

open5gs-master: drop unknown option metrics_impl

The metrics_impl option has been dropped in the related commit as
prometheus is now the default in open5gs. With newer meson, unknown
options are treated as errors (used to be warnings before).

Fix for:
ERROR: Unknown options: "metrics_impl"

Related: OS#6057
Related: https://github.com/open5gs/open5gs/commit/982ac61894ba5ac7b532661773df0cae859bb4f1
Change-Id: Ib859ef7389928019addecae08df2011eecda80ad

scripts/kernel-test: add KERNEL_SKIP_REBUILD

Speed up local test cycles by not building the kernel again from source
if not needed.

Change-Id: Iaa401918d7c09ec92ec546071d8961e99a4cbb47

scripts/kernel-test: add KERNEL_SKIP_SMOKE_TEST

Speed up local test cycles by not running the smoke test every time.

Change-Id: I505b74e8c9b221655a97c5464f6fe4f21204a894

kernel_test_prepare: use $DOCKER_ARGS

Use $DOCKER_ARGS in the docker run call to kernel-test/prepare.sh, which
builds the initramfs. I use this to make a local build of osmo-ggsn +
depends available in the docker container in /usr/local with the
ttcn3.sh script in osmo-dev.git.

Change-Id: Ie2500fa1bd9d57e2531463ce93fdd9930ad829d3