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_build_keys.py

@@ -279,3 +279,18 @@ def test_the_start_deletes_uploads_that_no_job_needs(builds, jobs, uploads, stor
     orchestrator.queue_epub_file(waiting, "story.epub")
     orchestrator.remove_stale_uploads()
     assert list(uploads.iterdir()) == [waiting]
+
+
+def test_a_missing_ingest_folder_fails_the_job_until_the_folder_exists(builds, jobs, monkeypatch, tmp_path):
+    monkeypatch.setattr(config, "INGEST_DIR", tmp_path / "not-mounted")
+    story_id = linked_story(ONE)
+    site(monkeypatch, ONE)
+    monkeypatch.setattr(orchestrator.time, "sleep", Mock())
+    jobs.add(Job(mode=DownloadMode.NEW, story_id=story_id))
+    job = orchestrator._run_next_job()
+    assert job.status == "error" and "does not exist. Check INGEST_DIR and the volume mount." in job.message
+    assert story(story_id)["status"] == "error"
+    assert not config.INGEST_DIR.exists()
+    config.INGEST_DIR.mkdir()
+    assert "library book 1" in update(story_id)
+    assert builds.call_count == 1