feat: use php-spx shell if enabled

Author: SamJUK

commands/shell.cmd

@@ -7,7 +7,9 @@ loadEnvConfig "${WARDEN_ENV_PATH}" || exit $?
 ## set defaults for this command which can be overridden either using exports in the user
 ## profile or setting them in the .env configuration on a per-project basis
 WARDEN_ENV_SHELL_COMMAND=${WARDEN_ENV_SHELL_COMMAND:-bash}
-WARDEN_ENV_SHELL_CONTAINER=${WARDEN_ENV_SHELL_CONTAINER:-php-fpm}
+
+WARDEN_ENV_DEFAULT_SHELL_CONTAINER=$([ $WARDEN_PHP_SPX == 1 ] && echo "php-spx" || echo "php-fpm")
+WARDEN_ENV_SHELL_CONTAINER=${WARDEN_ENV_SHELL_CONTAINER:-$WARDEN_ENV_DEFAULT_SHELL_CONTAINER}
 
 ## allow return codes from sub-process to bubble up normally
 trap '' ERR