test failure with mosquitto

[murraybd]

make test/mosquitto fails with the following error:

2024/10/17 19:53:51 INFO populating workspace /tmp/melange-workspace-2826290421 from ./mosquitto/
2024/10/17 19:53:51 INFO ImgRef = /tmp/melange-guest-3018673093
2024/10/17 19:53:51 INFO running the main test pipeline
2024/10/17 19:53:51 WARN + '[' -d /home/build ]
2024/10/17 19:53:51 WARN + cd /home/build
2024/10/17 19:53:51 WARN + TOPIC=test/topic
2024/10/17 19:53:51 WARN + MESSAGE='Hello, Mosquitto!'
2024/10/17 19:53:51 WARN + getent group mosquitto
2024/10/17 19:53:51 WARN /bin/sh: getent: not found
2024/10/17 19:53:51 WARN + addgroup -S mosquitto
2024/10/17 19:53:51 WARN addgroup: permission denied (are you root?)
2024/10/17 19:53:51 INFO ERROR: failed to test package. the test environment has been preserved:
2024/10/17 19:53:51 INFO   workspace dir: /tmp/melange-workspace-2826290421
2024/10/17 19:53:51 INFO   guest dir: /tmp/melange-guest-1507565706
2024/10/17 19:53:51 ERRO failed to test package: unable to run pipeline: unable to run pipeline: exit status 1
make: *** [Makefile:136: test/mosquitto] Error 1

Adding posix-libc-utils, which provides getent, as a test dep is not enough to resolve the issue as then addgroup fails.