Update to qemu 5 and add build for linux/arm/7
- Update to QEMU 5.0.0 from stable-backports
- Enable build platform
linux/arm/7
Note: as of right now, QEMU 5 is not available for linux/arm64
Edited by Alex Thomae
linux/arm/7
Note: as of right now, QEMU 5 is not available for linux/arm64