cirrus: Use kvm to avoid spurious CI failures in the default virtualization cluster

Author: MarcoFalke

.cirrus.yml

@@ -6,6 +6,7 @@ container:
   # Each project has 16 CPU in total, assign 2 to each container, so that 8 tasks run in parallel
   cpu: 2
   memory: 8G  # Set to 8GB to avoid OOM. https://cirrus-ci.org/guide/linux/#linux-containers
+  kvm: true  # Use kvm to avoid spurious CI failures in the default virtualization cluster, see https://github.com/bitcoin/bitcoin/issues/20093
 env:
   PACKAGE_MANAGER_INSTALL : "apt-get update && apt-get install -y"
   MAKEJOBS: "-j4"