This seems to be using the shell syntax which is known to not propagate signals. Instead of:
ENTRYPOINT bin/id-impl -Dconfig. ...
it should be using the syntax:
ENTRYPOINT ["bin/id-impl", "-Dconfig. ..."more", "arguments", "here" ]
Is there a repo and a set of instructions you can share to reproduce this? I’ve tried with chirper and I think chirper uses the correct syntax.