[test] runc fs2 tests under machine.slice

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

Author: kolyshkin

.github/workflows/test.yml

@@ -130,7 +130,11 @@ jobs:
         sudo chmod a+X $HOME # for Ubuntu 22.04 and later
 
     - name: integration test (fs driver)
-      run: sudo -E PATH="$PATH" script -e -c 'make local${{ matrix.rootless }}integration'
+      # GHA CI itself is run under system.slice, so runc fs2 driver creates containers under it
+      # (e.g. /system.slice/test_busybox, see cgroups/fs2/defaultpath.go), when unexpectedly
+      # something moves these to /system.slice/hosted-compute-agent.service). To work around
+      # this, let's run under machine.slice.
+      run: sudo -E PATH="$PATH" systemd-run --scope --slice=machine-runc.slice --unit=test script -e -c 'make local${{ matrix.rootless }}integration'
 
     - name: integration test (systemd driver)
       run: |