Allow configuration of Jira request timeout

We saw several unfurl failures due to Jira request timeouts. Make
the timeout configurable instead of using the 20s default from Safir.

changelog.d/20241205_124257_rra_DM_47974.md

@@ -0,0 +1,3 @@
+### New features
+
+- Allow configuration of the timeout when making requests to the Jira server instead of only using the 20s default.

src/unfurlbot/config.py

@@ -2,10 +2,13 @@
 
 from __future__ import annotations
 
+from datetime import timedelta
+
 from pydantic import Field, RedisDsn, SecretStr, field_validator
 from pydantic_settings import BaseSettings, SettingsConfigDict
 from safir.kafka import KafkaConnectionSettings
 from safir.logging import LogLevel, Profile
+from safir.pydantic import HumanTimedelta
 
 __all__ = ["Config", "config"]
 
@@ -90,6 +93,13 @@ class Config(BaseSettings):
         ),
     )
 
+    jira_timeout: HumanTimedelta = Field(
+        timedelta(seconds=20),
+        title="Jira request timeout",
+        description="How long to wait for a response from the Jira server.",
+        examples=["60s"],
+    )
+
     gafaelfawr_token: SecretStr = Field(
         ...,
         title="Gafaelfawr token",

src/unfurlbot/storage/jiraissues.py

@@ -50,6 +50,7 @@ async def get(self, path: str) -> dict:
         response = await self._http_client.get(
             f"{self._proxy_base}{path}",
             headers={"Authorization": f"Bearer {self._token}"},
+            timeout=config.jira_timeout.total_seconds(),
         )
         response.raise_for_status()  # add a proper error message
         return response.json()