ci: Run cockpit-machines tests in PRs

plans/cockpit-machines-basic.fmf

@@ -0,0 +1,32 @@
+adjust+:
+  when: revdeps == yes
+  enabled: true
+
+discover:
+    how: fmf
+    url: https://github.com/cockpit-project/cockpit-machines
+    ref: main
+
+execute:
+    how: tmt
+
+/basic:
+  summary: Run browser integration for basic functionality
+  require:
+    - cockpit-machines
+    - cockpit-system
+    - cockpit-ws
+    # it's a Recommends:, but sometimes dnf ignores it
+    - virt-install
+    # required by tests
+    - podman
+    - dbus-tools
+    - firewalld
+    - libvirt-daemon-driver-storage-iscsi
+    - targetcli
+  test: ./browser.sh basic
+  duration: 60m
+
+# Refer to:
+# https://github.com/cockpit-project/cockpit-machines/blob/main/test/browser/main.fmf
+