CI: don't include debug symbols for musl builds #3650

Job	Run time
Ubuntu/Debian packaging (Ubuntu 20.04)	7m 17s
ubuntu-20.04 (package, non-mavsdk_server)	6m 13s
alpine 3.19.0 (musl)	9m 40s
ubuntu-22.04 (package, non-mavsdk_server)	5m 31s
coverage (ubuntu-20.04)	5m 7s
android-arm	5m 17s
android-arm64	5m 22s
linux-armv6	3m 54s
linux-armv6-musl	9m 51s
android-x86	5m 26s
linux-armv7	3m 51s
ios	12m 33s
linux-armv7l-musl	9m 54s
android-x86_64	5m 15s
linux-arm64	3m 55s
ios_simulator	10m 21s
linux-arm64-musl	10m 33s
ubuntu-20.04 (mavsdk, hunter)	3m 41s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	5m 28s
macOS	21m 36s
ubuntu-22.04 (style and proto check)	1m 23s
macOS-framework	13m 22s
ubuntu-20.04 (mavsdk_server, superbuild)	39m 48s
Windows	11m 27s
ubuntu-22.04 (mavsdk_server, superbuild)	10m 38s
iOS XCFramework	1m 13s
	3h 48m 36s

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