Improve pkg_build command
Improve pkg_build command

treasure-data/omnibus-td-agent,GoogleCloudPlatform/google-fluentd,treasure-data/omnibus-td-agent,GoogleCloudPlatform/google-fluentd,iantalarico/google-fluentd,iantalarico/google-fluentd,GoogleCloudPlatform/google-fluentd,treasure-data/omnibus-td-agent,iantalarico/google-fluentd