Merge branch 'pini-docker-sigterm' into 'dev'

fix: gracefully exit on sigterm

See merge request !1410

release/docker/docker-entrypoint.sh

 #!/bin/sh
 set -uo pipefail
 
-function boolean () {
+boolean () {
   echo "$1" | sed -E 's/^(true|yes|1)$/true/i'
 }
 big_fat_warning='\033[01;31m**WARNING**:\033[0m'

release/docker/duniter.sh

 #!/bin/sh
+
+# Terminate gracefully on SIGTERM by propagating it to the 'node' process
+sigterm () {
+  echo "Received SIGTERM. Terminating..." >&2
+  pkill node
+  wait %1
+}
+trap 'sigterm' TERM
+
+# Main
 cd /duniter
 if [ "$1" != --home ]; then
   set -- --home /var/lib/duniter "$@"
 fi
-exec bin/duniter "$@"
 
+# Launch in background and wait
+# This way we can catch SIGTERM
+bin/duniter "$@" &
+wait %1