Add manage.py createcachetable to test fixture

dandi-archive requires this command to be run as part of system
initialization in order to initialize the database to serve as a Django
cache backend. it must be run in order for any endpoint with caching
enabled to work properly.

dandi/tests/fixtures.py

@@ -402,6 +402,19 @@ def docker_compose_setup() -> Iterator[dict[str, str]]:
                 env=env,
                 check=True,
             )
+            run(
+                [
+                    "docker-compose",
+                    "run",
+                    "--rm",
+                    "django",
+                    "./manage.py",
+                    "createcachetable",
+                ],
+                cwd=str(LOCAL_DOCKER_DIR),
+                env=env,
+                check=True,
+            )
             run(
                 [
                     "docker-compose",