Add RPC API endpoint env (#347)

Add `CHARON_EXECUTION_RPC_API_ENDPOINT` env

ticket: #346

Author: DiogoSantoss

.env.sample.holesky

@@ -69,6 +69,9 @@ LIGHTHOUSE_CHECKPOINT_SYNC_URL=https://checkpoint-sync.holesky.ethpandaops.io/
 # A list of beacon nodes to use if the primary list are offline or unhealthy.
 #CHARON_FALLBACK_BEACON_NODE_ENDPOINTS=
 
+# The address of the execution engine JSON-RPC API. 
+#CHARON_EXECUTION_CLIENT_RPC_ENDPOINT=
+
 # Override the charon logging level; debug, info, warning, error.
 #CHARON_LOG_LEVEL=
 

.env.sample.hoodi

@@ -69,6 +69,9 @@ LIGHTHOUSE_CHECKPOINT_SYNC_URL=https://checkpoint-sync.hoodi.ethpandaops.io/
 # A list of beacon nodes to use if the primary list are offline or unhealthy.
 #CHARON_FALLBACK_BEACON_NODE_ENDPOINTS=
 
+# The address of the execution engine JSON-RPC API. 
+#CHARON_EXECUTION_CLIENT_RPC_ENDPOINT=
+
 # Override the charon logging level; debug, info, warning, error.
 #CHARON_LOG_LEVEL=
 

.env.sample.mainnet

@@ -69,6 +69,9 @@ LIGHTHOUSE_CHECKPOINT_SYNC_URL=https://mainnet.checkpoint.sigp.io/
 # A list of beacon nodes to use if the primary list are offline or unhealthy.
 #CHARON_FALLBACK_BEACON_NODE_ENDPOINTS=
 
+# The address of the execution engine JSON-RPC API. 
+#CHARON_EXECUTION_CLIENT_RPC_ENDPOINT=
+
 # Override the charon logging level; debug, info, warning, error.
 #CHARON_LOG_LEVEL=
 

docker-compose.yml

@@ -101,6 +101,7 @@ services:
       - CHARON_LOKI_ADDRESSES=${CHARON_LOKI_ADDRESSES:-http://loki:3100/loki/api/v1/push}
       - CHARON_LOKI_SERVICE=charon
       - CHARON_NICKNAME=${CHARON_NICKNAME:-}
+      - CHARON_EXECUTION_CLIENT_RPC_ENDPOINT=${CHARON_EXECUTION_CLIENT_RPC_ENDPOINT:-http://nethermind:8545}
     ports:
       - ${CHARON_PORT_P2P_TCP:-3610}:${CHARON_PORT_P2P_TCP:-3610}/tcp # P2P TCP libp2p
     labels: