Use lua mirror site as backup to download sources #627

Job	Run time
Linux-musl (x86_64-linux-musl)	3m 42s
Linux-musl-apicheck (x86_64-linux-musl)	3m 45s
Linux-musl (aarch64-linux-musl)	3m 42s
Windows	1m 3s
Android	1m 43s
Mac-os	4m 1s
Mac-os-aarch64	3m 42s
Mac-os-cctools	2m 9s
Mac-os-aarch64-cctools	3m 40s
Mac-os-universal-cctools	0s
Notify-success	0s
Mac-os-universal	1s
	27m 28s

Provide feedback