Adding e2e testing

tests/e2e/wait_for_web.py

@@ -0,0 +1,24 @@
+import os
+import time
+import urllib.request
+
+
+base_url = os.getenv("E2E_BASE_URL", "http://web").rstrip("/")
+health_url = os.getenv("E2E_HEALTH_URL", f"{base_url}/")
+deadline = time.time() + int(os.getenv("E2E_WEB_TIMEOUT_SECONDS", "120"))
+last_error = None
+
+while time.time() < deadline:
+    try:
+        with urllib.request.urlopen(health_url, timeout=5) as response:
+            if response.status < 500:
+                break
+    except Exception as exc:
+        last_error = exc
+    time.sleep(2)
+else:
+    raise SystemExit(f"Timed out waiting for {health_url}: {last_error}")
+
+with urllib.request.urlopen(f"{base_url}/", timeout=5) as response:
+    if response.status >= 500:
+        raise SystemExit(f"Web returned HTTP {response.status} at {base_url}/")