chore(api): stop via SIGKILL
chore(api): stop via SIGKILL

api doesn't catch neither SIGTERM nor SIGINT, so when docker tries to stop it then timeout is
reached and destroys it.
Changing STOPSIGNAL to SIGKILL we speed up stop process.

isard-vdi/isard,isard-vdi/isard,isard-vdi/isard,isard-vdi/isard,isard-vdi/isard