Install ffmpeg too #243

Job	Run time
Windows MSVC Release	38m 15s
Windows MSVC Release	1h 0m 34s
Windows MSVC Release (wx master)	38m 16s
Windows MSVC Release (wx master)	33m 24s
Ubuntu Debug	5m 40s
Ubuntu Debug	5m 40s
Ubuntu Release	9m 40s
Ubuntu Release	9m 40s
Ubuntu AppImage	19m 8s
Ubuntu AppImage	20m 2s
macOS Release	28m 57s
macOS Release	28m 57s
macOS Release (arm64)	3m 16s
macOS Release (arm64)	1h 54m 9s
	6h 55m 38s

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