fixup! Fix docker-compose

Author: QuentinI

espresso/.env

@@ -34,7 +34,7 @@ OPERATOR_PRIVATE_KEY=0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf
 # cast wallet address --private-key $OPERATOR_PRIVATE_KEY
 OPERATOR_ADDRESS=0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266
 
-OP_BATCHER_PRIVATE_KEY=OPERATOR_PRIVATE_KEY
+OP_BATCHER_PRIVATE_KEY=$OPERATOR_PRIVATE_KEY
 
 # cast wallet address --mnemonic "test test ... junk" --hd-path "m/44'/60'/0'/0/1"
 PROPOSER_ADDRESS=0x70997970C51812dc3A010C7d01b50e0d17dc79C8