Fix validator for tagless deliverables

With the new release identification / naming schema [1] (like:
2023.1 Antelope) new stable branch naming was introduced (like:
stable/2023.1). This was not accepted in the validator command.
Previously the validator was fixed for 'std' and 'std-with-versions'
branching typed deliverables, but missed the 'tagless' deliverables
case. This patch fixes this by accepting the new branch naming style,
stable/<release-id>, for tagless deliverables, too.

[1] https://governance.openstack.org/tc/reference/release-naming.html

Change-Id: I6ba51454213e095e6b76e0813dab3ce44b1457ba

openstack_releases/cmds/validate.py

@@ -1699,7 +1699,7 @@ def validate_stable_branches(deliv, context):
                             'or stable/<year>.<release_number> (for example: '
                             'stable/2023.1) or bugfix/%s' % (
                                 branch.name, deliv.series, expected_version))
-                elif branch_mode == 'std':
+                elif branch_mode == 'std' or branch_mode == 'tagless':
                     # Looking for SLURP naming (e.g: 2023.1)
                     if not _is_branch_with_release_id(branch.name):
                         context.error(

openstack_releases/tests/test_validate.py

@@ -2390,6 +2390,31 @@ class TestValidateStableBranches(base.BaseTestCase):
         self.assertEqual(0, len(self.ctx.warnings))
         self.assertEqual(0, len(self.ctx.errors))
 
+    def test_tagless_stable_branch_type_with_release_id(self):
+        deliverable_data = textwrap.dedent('''
+        stable-branch-type: tagless
+        releases:
+          - version: 99.0.3
+            projects:
+              - repo: openstack/release-test
+                hash: 0cd17d1ee3b9284d36b2a0d370b49a6f0bbb9660
+        branches:
+          - name: stable/2022.2
+            location:
+              openstack/release-test: 0cd17d1ee3b9284d36b2a0d370b49a6f0bbb9660
+        repository-settings:
+          openstack/release-test: {}
+        ''')
+        deliv = deliverable.Deliverable(
+            team='team',
+            series='antelope',
+            name='release-test',
+            data=yamlutils.loads(deliverable_data),
+        )
+        validate.validate_stable_branches(deliv, self.ctx)
+        self.assertEqual(0, len(self.ctx.warnings))
+        self.assertEqual(0, len(self.ctx.errors))
+
     def test_tempest_plugin(self):
         deliverable_data = textwrap.dedent('''
         type: tempest-plugin