add a docker-compose file to run rundler locally.

etc/README.md

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+## Miscellaneous
+
+This directory contains miscellaneous files, such as example docker file.
+
+The files in this directory may undergo a lot of changes while reth is unstable, so do not expect them to necessarily be up to date.
+
+### Overview 
+
+- [local](./local/): An example docker compose file to run rundler locally.

etc/local/docker-compose.yaml

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+version: "3.8"
+
+services:
+  geth:
+    image: ethereum/client-go:release-1.14
+    ports: [ '8545:8545' ]
+    command: --verbosity 1
+      --http.vhosts '*,localhost,host.docker.internal'
+      --http
+      --http.api eth,net,web3,debug
+      --http.corsdomain '*'
+      --http.addr "0.0.0.0"
+      --networkid 1337
+      --dev
+      --dev.period 0
+      --allow-insecure-unlock
+      --rpc.allow-unprotected-txs
+      --rpc.txfeecap 0
+      --dev.gaslimit 20000000
+
+  rundler-local:
+    build:
+      context: ../../
+      dockerfile: Dockerfile
+    command: node
+    depends_on:
+      - geth
+    ports:
+      # RPC port
+      - "3000:3000"
+      # Metrics port
+      - "8080:8080"
+    environment:
+      - RUST_LOG=debug
+      - NETWORK=dev
+      - NODE_HTTP=http://geth:8545
+      - MIN_UNSTAKE_DELAY=2
+      - PRIORITY_FEE_MODE_KIND=base_fee_percent
+      - PRIORITY_FEE_MODE_VALUE=0
+      - DISABLE_ENTRY_POINT_V0_6=true
+      - DISABLE_ENTRY_POINT_V0_7=false
+      - NODE_HTTP=http://geth:8545
+      - RPC_API=eth,debug
+      - BUILDER_PRIVATE_KEY=0x0000000000000000000000000000000000000000000000000000000000000002