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Description:
Add optional configurable WebUI PORT.
Benefits of this PR and context:
The current image cannot change the internal port of WebUI. This commit adds the PORT environment variable to avoid port conflicts that may be caused by hardcoded port when using the host network.
How Has This Been Tested?
I built an image from a Dockerfile and used it to create and run 2 containers simultaneously on the same host. Both Syncthing instances are successfully accessible through the GUI on the assigned ports, local discovery functions properly, and the instances are able to connect directly to other Syncthing instances on the local network.
Source / References:
[FEAT] Add option to set listen address for GUI #65