Use prefect ephemeral mode

Author: jlowin

src/controlflow/settings.py

@@ -119,6 +119,18 @@ class Settings(ControlFlowSettings):
         alias="PREFECT_LOGGING_LEVEL",
     )
 
+    prefect_api_url: Optional[str] = Field(
+        default=None,
+        description="The URL for the Prefect API. Leave unset to use an ephemeral API.",
+        alias="PREFECT_API_URL",
+    )
+
+    prefect_server_allow_ephemeral_mode: bool = Field(
+        default=True,
+        description="If True, ephemeral mode will be allowed for Prefect Server.",
+        alias="PREFECT_SERVER_ALLOW_EPHEMERAL_MODE",
+    )
+
     _prefect_context: contextmanager = None
 
     @field_validator("home_path", mode="before")
@@ -145,7 +157,11 @@ def _apply_prefect_settings(self):
             self._prefect_context.__exit__(None, None, None)
             self._prefect_context = None
 
-        settings_map = {"prefect_log_level": prefect.settings.PREFECT_LOGGING_LEVEL}
+        settings_map = {
+            "prefect_log_level": prefect.settings.PREFECT_LOGGING_LEVEL,
+            "prefect_api_url": prefect.settings.PREFECT_API_URL,
+            "prefect_server_allow_ephemeral_mode": prefect.settings.PREFECT_SERVER_ALLOW_EPHEMERAL_MODE,
+        }
 
         prefect_settings = {}