ci: pass LITELLM_MASTER_KEY to the build_and_test proxy container

Co-Authored-By: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>

.circleci/config.yml

@@ -1771,6 +1771,7 @@ jobs:
               -e LANGFUSE_PROJECT2_SECRET=$LANGFUSE_PROJECT2_SECRET \
               -e RECORDER_OPENAI_BASE_URL=http://host.docker.internal:8090/v1 \
               -e LITELLM_LOG=ERROR \
+              -e LITELLM_MASTER_KEY="sk-1234" \
               --add-host host.docker.internal:host-gateway \
               --name my-app \
               -v $(pwd)/proxy_server_config.yaml:/app/config.yaml \