NOTE: Before starting to pack QPKG, install docker.
This repo provides Docker image dorowu/qdk2-build and a sample QPKG source of Redmine, a blogging platform to show how easily to pack Dockerized QPKG.
$ git clone https://github.com/qnap-dev/docker-qdk2.git
$ cd docker-qdk2
$ docker run -it --rm -v ${PWD}/example/redmine:/src dorowu/qdk2-build
Creating archive with data files...
tar: 10kB 0:00:00 [18.8MB/s] [=========================================================] 158%
Creating archive with control files...
Creating QPKG package...
-rw-r--r-- 1 1000 1000 24337 Mar 17 02:35 redmine_3.3.0_x86_64.qpkg
$ ls -l example/redmine/redmine_3.3.0.qpkg
-rw-r--r-- 1 u u 24337 Mar 17 10:35 example/redmine/redmine_3.3.0_x86_64.qpkg
A QPKG was created in example/redmine/build/redmine_3.3.0_x86_64.qpkg. Make sure there is Container Station installed on QNAP NAS, then manually install it in App Center.