Changes

osmo-ns-master: drop python3-osmopy-utils / --enable-external-tests

--enable-external-tests requires python3-osmopy-utils, however this
package is no longer available for debian:10.  We're not running
tests, so it's not really needed.  Removing it fixes ttcn3-ns-test-fr.

Change-Id: I342099be87175dfe189a8906b53ee26328c0a417

ttcn3-bts-test: fail on unexpected respawn count

Suggested-by: Pau Espin Pedrol <pespin@sysmocom.de>
Change-Id: Idd9f8dcf1a7186a0715c1026da44f404c1c574d9

debian-trixie-obs-latest: fix signed-by= path

Fix for:
  Error: Failed to parse keyring "/usr/share/keyrings/osmocom-misc.asc"

Fixes: 59d469 ("debian-trixie-build: install the osmocom:misc repo")
Change-Id: Ib90abcdf96fc2b555f477899bac730c6f4a76fad

debian-trixie-build: install the osmocom:misc repo

Install the osmocom:misc repository, so we can use the latest bpftrace
version in ttcn3-bts-test.

Related: OS#6927
Change-Id: I58e91932b089a92f4f4c31814cd1fd7d202b04c0