DEVX-148: fix: add fallback URL for tea download

Co-authored-by: oblachno Admin <admin@oblachno.oblachno.fyi>

tests/unit/test_install_tools.py

@@ -233,6 +233,33 @@ class TestInstallTea:
                         assert install_tools.install_tea() is True
         assert (tmp_path / "tea").exists()
 
+    def test_install_fallback_to_second_url(self, tmp_path: Path) -> None:
+        """First URL fails (403), second URL succeeds."""
+        call_count = [0]
+
+        def _download_side_effect(url: str, dest: Path) -> None:
+            call_count[0] += 1
+            if call_count[0] == 1:
+                raise OSError("HTTP Error 403: Forbidden")
+            Path(dest).write_bytes(b"binary")
+
+        with patch.object(install_tools, "_is_installed", return_value=False):
+            with patch.object(install_tools, "TARGET_DIR", tmp_path):
+                with patch.object(platform, "machine", return_value="x86_64"):
+                    with patch.object(install_tools, "_download", side_effect=_download_side_effect):
+                        assert install_tools.install_tea() is True
+        assert (tmp_path / "tea").exists()
+        assert call_count[0] == 2
+
+    def test_install_all_urls_fail(self, tmp_path: Path) -> None:
+        """All URLs fail — should raise ClickException."""
+        with patch.object(install_tools, "_is_installed", return_value=False):
+            with patch.object(install_tools, "TARGET_DIR", tmp_path):
+                with patch.object(platform, "machine", return_value="x86_64"):
+                    with patch.object(install_tools, "_download", side_effect=OSError("403 Forbidden")):
+                        with pytest.raises(ClickException, match="Failed to download tea"):
+                            install_tools.install_tea()
+
 
 class TestInstallHadolint:
     def test_already_installed(self) -> None: