🐛 fix(ci): inline gitea workflow bootstrap

remove the pre-checkout dependency on .gitea/ci/prepare_repo.sh
from the root workflows and inline the bootstrap logic instead.

add a regression test for workflow bootstrap ordering and register
it in the tests README.

tests/test_gitea_workflow_bootstrap.py

@@ -0,0 +1,22 @@
+import unittest
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+TEST_WORKFLOW = ROOT / ".gitea" / "workflows" / "test.yml"
+STANDARDS_WORKFLOW = ROOT / ".gitea" / "workflows" / "standards-check.yml"
+
+
+class GiteaWorkflowBootstrapTests(unittest.TestCase):
+    def test_repo_workflows_do_not_call_repo_local_prepare_script_before_checkout(self):
+        for workflow in (TEST_WORKFLOW, STANDARDS_WORKFLOW):
+            text = workflow.read_text(encoding="utf-8")
+            with self.subTest(workflow=workflow.name):
+                self.assertNotIn("bash .gitea/ci/prepare_repo.sh", text)
+                self.assertIn('REPO_DIR="${WORKSPACE_DIR}/${REPO_NAME}"', text)
+                self.assertIn('git clone "$REPO_URL" "$REPO_DIR"', text)
+                self.assertIn('echo "REPO_DIR=$REPO_DIR" >> "$GITHUB_ENV"', text)
+
+
+if __name__ == "__main__":
+    unittest.main()