Explicitely but gracefully handle SIGINT and SIGTERM signals. #787
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Fixes #557.
As specified in the Docker documentation,
a process running as PID 1 inside a container is treated specially by Linux: it ignores any signal with the default action. So, the process will not terminate on SIGINT or SIGTERM unless it is coded to do so.
which is the reason why awebpack-dev-server
run from a Docker container cannot be stopped which forces Docker to kill it after the standard 10s timeout. Explicitely handling the SIGTERM and SIGINT signals fixes this and allow much faster graceful shutdowns.