fix image entrypoint sigterm

- Change PostgreSQL volume mount from /var/lib/postgresql/data to /var/lib/postgresql
  This allows PostgreSQL to manage the data directory structure internally

- Add PostgreSQL version configuration variable to all docker-compose files:
  * POSTGRES_VERSION for deployment/nginx
  * APPSEC_POSTGRES_VERSION for all deployment/docker-compose variants

- Update PostgreSQL image tag to use version variable (set to version 18)
  Changed from 'postgres' to 'postgres:' or 'postgres:'

- Add PostgreSQL version variable to all .env files with default value of 18

Co-authored-by: Nahum Perman <nahump@checkpoint.com>

build_system/docker/entry.sh

@@ -15,6 +15,21 @@ var_mode=
 var_token=
 var_ignore=
 init=
+active_watchdog_pid=
+
+cleanup() {
+    local signal="$1"
+    echo "[$(date '+%Y-%m-%d %H:%M:%S')] Signal ${signal} was received, exiting gracefully..." >&2
+    if [ -n "${active_watchdog_pid}" ] && ps -p ${active_watchdog_pid} > /dev/null 2>&1; then
+        kill -TERM ${active_watchdog_pid} 2>/dev/null || true
+        wait ${active_watchdog_pid} 2>/dev/null || true
+    fi
+    echo "Cleanup completed. Exiting now." >&2
+    exit 0
+}
+
+trap 'cleanup SIGTERM' SIGTERM
+trap 'cleanup SIGINT' SIGINT
 
 if [ ! -f /nano-service-installers/$ORCHESTRATION_INSTALLATION_SCRIPT ]; then
     echo "Error: agent installation package doesn't exist."