fix: separate docker-args outputs to avoid arg collisions

Emitting the restart policy as a `--restart` argument from a `docker-args-process-deploy` trigger exposed a latent gluing bug: proxy and builder triggers concatenated `$STDIN$output` with no separator, and the scheduler and builders appended `docker-args-process-*` output directly onto the older `docker-args-*` output, so adjacent arguments could merge into values like `--restart=on-failure:10--label`. A space is now inserted at both the trigger echo and the concatenation so arguments always stay separated.

plugins/scheduler-docker-local/bin/scheduler-deploy-process-container

@@ -24,7 +24,7 @@ main() {
     DOCKER_ARGS+=" --init"
   fi
   DOCKER_ARGS+=" $DOCKER_RUN_LABEL_ARGS $DOKKU_GLOBAL_RUN_ARGS "
-  DOCKER_ARGS+=$(: | plugn trigger docker-args-process-deploy "$APP" "$IMAGE_SOURCE_TYPE" "$IMAGE_TAG" "$PROC_TYPE" "$CONTAINER_INDEX")
+  DOCKER_ARGS+=" $(: | plugn trigger docker-args-process-deploy "$APP" "$IMAGE_SOURCE_TYPE" "$IMAGE_TAG" "$PROC_TYPE" "$CONTAINER_INDEX")"
   [[ "$DOKKU_TRACE" ]] && DOCKER_ARGS+=" --env=TRACE=true"
 
   local START_CMD