fix: wait for Graph node before subgraph deployment

Add a retry loop to wait for the Graph node to be ready on port 8020
before attempting to create and deploy the subgraph.

Author: rodrigopavezi

.circleci/config.yml

@@ -43,6 +43,15 @@ references:
     name: 'Subgraph deployment and configuration'
     working_directory: ~/
     command: |
+      # Wait for Graph node to be ready
+      for i in $(seq 1 30); do
+        if curl -s http://localhost:8020 > /dev/null 2>&1; then
+          echo "Graph node is ready"
+          break
+        fi
+        echo "Waiting for Graph node... ($i/30)"
+        sleep 2
+      done
       git clone https://github.com/RequestNetwork/storage-subgraph
       cd storage-subgraph
       yarn