Update deploy workflow to use 'master' branch and add unit tests for deployment triggers

tests/test_deploy_workflow.py

@@ -0,0 +1,23 @@
+import re
+import unittest
+from pathlib import Path
+
+
+class DeployWorkflowTests(unittest.TestCase):
+    def test_deploy_workflow_triggers_on_master_pushes(self):
+        workflow_path = Path(__file__).resolve().parents[1] / ".gitea" / "workflows" / "deploy-ftp.yml"
+        workflow_text = workflow_path.read_text(encoding="utf-8")
+
+        branch_block_match = re.search(
+            r"on:\s*\n\s*push:\s*\n\s*branches:\s*\n(?P<branches>(?:\s*-\s*[^\n]+\n)+)",
+            workflow_text,
+        )
+
+        self.assertIsNotNone(branch_block_match, "workflow should define push branches")
+        branches = re.findall(r"-\s*([^\n]+)", branch_block_match.group("branches"))
+
+        self.assertEqual(branches, ["master"])
+
+
+if __name__ == "__main__":
+    unittest.main()