optimizations for docker

[kmou424]

1. use /data as default data dir (a temporary workaround, use other environment variable that implemented in backend to set data dir will be better)
2. set more permissive permissions to allow any user or group to make changes in /app and /data (now we can use --user $(id -u):$(id -g) to set user and group in docker)
3. optimize docker build process, now you can completely build project with docker

[kmou424]

need fix up the lost part of artifacts

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