Add developer tag to AppStream metadata #1763

Job	Run time
Windows CI	8m 25s
MacOS CI (macos-13, Portaudio)	7m 1s
Linux CI (ubuntu:20.04, Pulseaudio)	2m 43s
MacOS CI (macos-13, Gr-audio)	6m 43s
MacOS CI (macos-latest, Portaudio)	4m 11s
MacOS CI (macos-latest, Gr-audio)	3m 56s
Linux CI (ubuntu:20.04, Portaudio)	3m 4s
Linux CI (ubuntu:20.04, Gr-audio)	2m 46s
Linux CI (ubuntu:22.04, Pulseaudio)	3m 1s
Linux CI (ubuntu:22.04, Portaudio)	2m 48s
Linux CI (ubuntu:22.04, Gr-audio)	2m 54s
Linux CI (ubuntu:24.04, Pulseaudio)	3m 28s
Linux CI (ubuntu:24.04, Portaudio)	3m 7s
Linux CI (ubuntu:24.04, Gr-audio)	3m 22s
	57m 29s

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