chore: 💚 add configuration file

Author: liuzeming1

backend/configuration.yaml.example

@@ -0,0 +1,43 @@
+server:
+  port: ${PORT}
+  rpcPort: ${RPC_PORT}
+
+snapshot:
+  rpc: ${SNAPSHOT_RPC}
+
+drand:
+  url:
+    - "https://api.drand.secureweb3.com:6875"
+    - "https://api.drand.sh/"
+    - "https://api2.drand.sh/"
+    - "https://api3.drand.sh/"
+    - "https://drand.cloudflare.com/"
+  chainHash: "52db9ba70e0cc0f6eaf7803dd07447a1f5477735fd3f661792ba94600c84e971"
+
+github:
+  token: ${GITHUB_TOKEN}
+
+mysql:
+  url: ${MYSQL_NODE}
+  username: ${MYSQL_USER}
+  password: ${MYSQL_PASSWORD}
+
+network:
+  chainId: ${CHAIN_ID}
+  name: ${CHAIN_NAME}
+  rpc: ${CHAIN_RPC_NODE}
+  syncEventStartHeight: ${SYNC_EVENT_START_HEIGHT}
+  oracleContract: ${ORACLE_CONTRACT}
+  minerIdPrefix: ${MINER_ID_PREFIX}
+
+  oraclePowersContract: ${ORACLE_POWERS_CONTRACT}
+  powerVotingContract: ${POWERVOTING_CONTRACT}
+
+  fipContract: ${FIP_CONTRACT}
+  fipInitEditor: ${FIP_INIT_EDITOR}
+
+abiPath:
+  powerVotingAbi: ${POWERVOTING_ABI_PATH}
+  oraclePowersAbi: ${ORACLE_POWERS_ABI_PATH}
+  oracleAbi: ${ORACLE_ABI_PATH}
+  fipAbi: ${FIP_ABI_PATH}