feat(libvirt): add openSUSE to supported platform

* saltstack-formulas/libvirt-formula#51
* saltstack-formulas/libvirt-formula#53 (comment)

Author: myii

ssf/defaults.yaml

@@ -15,7 +15,7 @@ ssf_node_anchors:
             #       An alternative method could be to use:
             #       `git describe --abbrev=0 --tags`
             title: 'chore: use `semantic-release` cross-formula standard structure'
-            body: '* Automated using https://github.com/myii/ssf-formula/pull/15'
+            body: '* Automated using https://github.com/myii/ssf-formula/pull/17'
           github:
             owner: saltstack-formulas
             repo: ''

ssf/formulas.yaml

@@ -536,6 +536,7 @@ ssf:
                 - ubuntu
                 - centos
                 - fedora
+                - opensuse
         old_ci_files: true
         platforms:
           # [os           , os_ver, salt_ver, py_ver]