Add tests for SSH transport and template deployment functionality

- Introduced a new test to verify behavior when SSH transport connects but is not ready, ensuring it returns False after the deadline.
- Added comprehensive tests for the `deploy-linux` template, covering various scenarios including missing public keys, VM directory existence, SHA256 mismatches, and failures during ISO creation and VM conversion.
- Implemented tests for SSH-related functions, including connection retries and streaming command execution, ensuring proper handling of exit statuses and progress indications.
- Enhanced existing tests to cover edge cases and ensure robustness in the deployment process.

tests/python/test_ssh_transport.py

@@ -443,3 +443,38 @@ def test_connect_reuses_existing_client(monkeypatch: pytest.MonkeyPatch) -> None
     assert client.commands == ["first", "second"]
     # Only one connect attempt.
     assert client.connect_kwargs["hostname"] == "10.0.0.2"
+
+
+# ── run_streaming: progressed=True but exit not yet ready → loop back ─────────
+
+
+def test_run_streaming_progressed_no_sleep_loops_back(
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    """Data received (progressed=True) but exit_status_ready()=False on first check.
+
+    Covers the ``if not progressed: time.sleep(0.05)`` branch when progressed
+    is True — no sleep occurs, loop continues (branch 170->150).
+    """
+    slept: list[float] = []
+    monkeypatch.setattr("ci_orchestrator.transport.ssh.time.sleep", slept.append)
+
+    class _ProgressedNoBreakChannel(_FakeStreamingChannel):
+        def __init__(self) -> None:
+            super().__init__([b"hello"], [], rc=0)
+            self._ready_count = 0
+
+        def exit_status_ready(self) -> bool:
+            # First call: stdout already drained but signal exit not yet ready.
+            # Subsequent calls: ready → break.
+            self._ready_count += 1
+            return self._ready_count > 1
+
+    chan = _ProgressedNoBreakChannel()
+    client = _FakeSSHClientWithTransport(chan)
+    _install_fake_paramiko(monkeypatch, client)
+    t = SshTransport("10.0.0.2", key_path="/tmp/key")
+    result = t.run_streaming("cmd")
+    assert result.stdout == "hello"
+    # sleep must NOT have been called (progressed=True skips sleep branch)
+    assert not slept