Do not make the ingest folder

A folder that Bindery made hid a missing volume mount. The books went
to a folder inside the container, and CWA never saw them. A missing
folder is now an error in the log at the start, and each upload fails
with a message that names the mount.

tests/test_config.py

@@ -188,3 +188,16 @@ def test_prepare_warns_about_a_cwa_password_without_a_user_name(monkeypatch, tmp
     with caplog.at_level("WARNING"):
         config.prepare()
     assert ("CWA_PASSWORD is set" in caplog.text) is warns
+
+
+@pytest.mark.parametrize("exists", [False, True])
+def test_prepare_does_not_make_the_ingest_folder(monkeypatch, tmp_path, caplog, exists):
+    monkeypatch.setattr(config, "CWA_URL", "https://cwa.invalid")
+    for name, folder in [("CONFIG_DIR", "config"), ("UPLOAD_DIR", "uploads"), ("TMP_DIR", "tmp"), ("INGEST_DIR", "in")]:
+        monkeypatch.setattr(config, name, tmp_path / folder)
+    monkeypatch.setattr(config, "PERSONAL_INI", tmp_path / "config" / "personal.ini")
+    if exists:
+        config.INGEST_DIR.mkdir()
+    config.prepare()
+    assert config.INGEST_DIR.exists() is exists
+    assert ("does not exist. Check INGEST_DIR and the volume mount" in caplog.text) is not exists