Add fees to demo

.env

@@ -33,15 +33,15 @@ ESPRESSO_SEQUENCER2_API_PORT=50002
 ESPRESSO_SEQUENCER3_API_PORT=50003
 ESPRESSO_SEQUENCER4_API_PORT=50004
 ESPRESSO_SEQUENCER_MAX_BLOCK_SIZE=10kb
-ESPRESSO_SEQUENCER_BASE_FEE=0
+ESPRESSO_SEQUENCER_BASE_FEE=1
 ESPRESSO_SEQUENCER_URL=http://sequencer0:${ESPRESSO_SEQUENCER_API_PORT}
 ESPRESSO_SEQUENCER_STORAGE_PATH=/store/sequencer
 ESPRESSO_SEQUENCER_L1_PORT=8545
 ESPRESSO_SEQUENCER_L1_WS_PORT=8546
 ESPRESSO_SEQUENCER_L1_PROVIDER=http://demo-l1-network:${ESPRESSO_SEQUENCER_L1_PORT}
 ESPRESSO_SEQUENCER_ETH_MNEMONIC="test test test test test test test test test test test junk"
 # The first account is the permission less builder, the last are sequencer0 to 4
-ESPRESSO_SEQUENCER_PREFUNDED_BUILDER_ACCOUNTS=0x23618e81E3f5cdF7f54C3d65f7FBc0aBf5B21E8f,0xBcd4042DE499D14e55001CcbB24a551F3b954096,0x71bE63f3384f5fb98995898A86B02Fb2426c5788,0xFABB0ac9d68B0B445fB7357272Ff202C5651694a,0x1CBd3b2770909D4e10f157cABC84C7264073C9Ec,0xdF3e18d64BC6A983f673Ab319CCaE4f1a57C7097
+ESPRESSO_SEQUENCER_PREFUNDED_BUILDER_ACCOUNTS=0x23618e81E3f5cdF7f54C3d65f7FBc0aBf5B21E8f
 ESPRESSO_COMMITMENT_TASK_PORT=60000
 ESPRESSO_SEQUENCER_DB_PORT=5432
 ESPRESSO_STATE_RELAY_SERVER_PORT=40004
@@ -50,6 +50,7 @@ ESPRESSO_STATE_RELAY_SERVER_URL=http://state-relay-server:${ESPRESSO_STATE_RELAY
 # Ethereum accounts (note 11-15 are used by the sequencer nodes)
 ESPRESSO_SEQUENCER_HOTSHOT_ACCOUNT_INDEX=5
 ESPRESSO_SEQUENCER_STATE_PROVER_ACCOUNT_INDEX=7
+ESPRESSO_BUILDER_ETH_ACCOUNT_INDEX=8
 ESPRESSO_DEPLOYER_ACCOUNT_INDEX=9
 
 # Contracts