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/builder-pack/builder-build

@@ -38,7 +38,7 @@ trigger-builder-pack-builder-build() {
   plugn trigger pre-build "$BUILDER_TYPE" "$APP" "$SOURCECODE_WORK_DIR"
 
   local DOCKER_ARGS=$(: | plugn trigger docker-args-build "$APP" "$BUILDER_TYPE")
-  DOCKER_ARGS+=$(: | plugn trigger docker-args-process-build "$APP" "$BUILDER_TYPE")
+  DOCKER_ARGS+=" $(: | plugn trigger docker-args-process-build "$APP" "$BUILDER_TYPE")"
   [[ "$DOKKU_TRACE" ]] && DOCKER_ARGS+=" --env=TRACE=true "
 
   DOCKER_ARGS=" $DOCKER_ARGS "

plugins/builder-pack/docker-args-process-deploy

@@ -23,7 +23,7 @@ trigger-builder-pack-docker-args-process-deploy() {
     output=" --entrypoint launcher"
   fi
 
-  echo -n "$STDIN$output"
+  echo -n "$STDIN $output"
 }
 
 trigger-builder-pack-docker-args-process-deploy "$@"