Teach it about a CI profile

This profile does not have time-based warnings.

src/allmydata/test/__init__.py

@@ -25,6 +25,34 @@ def disable_foolscap_incidents():
 # we disable incident reporting for all unit tests.
 disable_foolscap_incidents()
 
+
+def _configure_hypothesis():
+    from os import environ
+
+    from hypothesis import (
+        HealthCheck,
+        settings,
+    )
+
+    settings.register_profile(
+        "ci",
+        suppress_health_check=[
+            # CPU resources available to CI builds typically varies
+            # significantly from run to run making it difficult to determine
+            # if "too slow" data generation is a result of the code or the
+            # execution environment.  Prevent these checks from
+            # (intermittently) failing tests that are otherwise fine.
+            HealthCheck.too_slow,
+        ],
+        # With the same reasoning, disable the test deadline.
+        deadline=None,
+    )
+
+    profile_name = environ.get("TXKUBE_HYPOTHESIS_PROFILE", "default")
+    settings.load_profile(profile_name)
+_configure_hypothesis()
+
+
 import sys
 if sys.platform == "win32":
     from allmydata.windows.fixups import initialize