ci: make /dev/kvm accessible on the 26.04 runners

The libvirt qemu user must reach /dev/kvm for the hypervisor VMs, and
the 26.04 runner images ship the device without access for it.

Author: fwiesel

.github/actions/test/integration/dependencies/action.yml

@@ -26,6 +26,12 @@ runs:
         echo 'security_driver = "none"' | sudo tee -a /etc/libvirt/qemu.conf
         sudo systemctl restart libvirtd
 
+    # The libvirt qemu user must reach /dev/kvm for the hypervisor VMs.
+    - name: Make /dev/kvm accessible
+      shell: bash
+      run: |
+        if [ -e /dev/kvm ]; then sudo chmod 666 /dev/kvm; fi
+
     - name: oras
       uses: oras-project/setup-oras@1d808f7d7f6995cc68b7bf507bfe5c5446e1dc9d # v2
       with: