Flatpak / Flathub release #249

Job	Run time
Test Processing	3m 56s
(linux/x64) Create Processing Build	10m 6s
(macos/x64) Create Processing Build	9m 21s
(linux/aarch64) Create Processing Build	7m 59s
(macos/aarch64) Create Processing Build	4m 20s
(windows/x64) Create Processing Build	5m 57s
	41m 39s

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