create an empty default welcome file #4205

Job	Run time
Build vars & Github release (if required)	12s
Build for Android .apk (artifact+codeQL)	25m 52s
Build for Linux .deb amd64 (artifacts+codeQL)	8m 59s
Build for Linux .deb armhf (artifacts)	5m 17s
Build for Linux .deb arm64 (artifacts)	5m 17s
Build for MacOS (artifacts)	14m 7s
Build for MacOS Legacy (artifacts+CodeQL)	23m 23s
Build for iOS (artifacts)	5m 53s
Build for Windows (artifact+codeQL)	37m 59s
Build for Windows JACK (artifact)	9m 45s
Create files for .deb repository (if requested)	0s
	2h 16m 44s

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