ci: install a newer version of qemu for the aarch64/ia32 tests

This fixes a segfault on exit. #259

Author: nicholasbishop

.github/workflows/rust.yml

@@ -18,8 +18,11 @@ jobs:
 
  - name: Install qemu and OVMF
  run: |
+ # Ubuntu 20.04 provides qemu 4.2, which crashes on exit in this
+ # test. Add a PPA to provide a more recent version of qemu.
+ sudo add-apt-repository ppa:canonical-server/server-backports
  sudo apt-get update
- sudo apt-get install qemu-system-aarch64 qemu-efi-aarch64 -y
+ sudo apt-get install qemu-system-arm qemu-efi-aarch64 -y
  # Copy the files so that the vars file isn't read-only.
  cp /usr/share/AAVMF/AAVMF_CODE.fd uefi-test-runner/QEMU_EFI-pflash.raw
  cp /usr/share/AAVMF/AAVMF_VARS.fd uefi-test-runner/vars-template-pflash.raw
@@ -75,6 +78,9 @@ jobs:
 
  - name: Install qemu
  run: |
+ # Ubuntu 20.04 provides qemu 4.2, which crashes on exit in this
+ # test. Add a PPA to provide a more recent version of qemu.
+ sudo add-apt-repository ppa:canonical-server/server-backports
  sudo apt-get update
  sudo apt-get install qemu-system-x86 -y