chore: update docker env close #11703 (#11706)

Signed-off-by: yihong0618 <zouzou0208@gmail.com>

docker/.env.example

 
 # Enable or disable create tidb service job
 CREATE_TIDB_SERVICE_JOB_ENABLED=false
+
+# Maximum number of submitted thread count in a ThreadPool for parallel node execution
+MAX_SUBMIT_COUNT=100

docker/docker-compose.yaml

   OCEANBASE_CLUSTER_NAME: ${OCEANBASE_CLUSTER_NAME:-difyai}
   OCEANBASE_MEMORY_LIMIT: ${OCEANBASE_MEMORY_LIMIT:-6G}
   CREATE_TIDB_SERVICE_JOB_ENABLED: ${CREATE_TIDB_SERVICE_JOB_ENABLED:-false}
+  MAX_SUBMIT_COUNT: ${MAX_SUBMIT_COUNT:-100}
   RETRIEVAL_TOP_N: ${RETRIEVAL_TOP_N:-0}
   HTTP_PROXY: ${HTTP_PROXY:-}
   HTTPS_PROXY: ${HTTPS_PROXY:-}