fix: set an address for authrpc to the op-rbuilder readme (#581)

This PR fixes the launch instructions for `op-rbuilder`, making the
AuthRPC accessible on all network interfaces. This is necessary to allow
`op-rbuilder` to be reachable from the virtual network interface created
by Docker.

Additionally, the metrics port has been changed to `9011`, since `9001`
is used by `builder-playground` for the `beacon`:

```
go run main.go cook opstack --external-builder http://host.docker.internal:4444
2025/04/23 20:21:02 Log level: info
2025/04/23 20:21:02 Genesis block hash: 0x301f9f301f868d587fec26c2a1b5f7d9896736842ab1787923722c3213b61e05
true

========= Services started =========
- el (authrpc: 8551/8551, http: 8545/8545, rpc: 30303/30303)
- beacon (http: 3500/3500, p2p: 9000/9000/udp, p2p: 9000/9001, quic-p2p: 9100/9100)
- validator ()
- rollup-boost (authrpc: 8551/8552)
- op-node (http: 8549/8549, metrics: 7300/7300, p2p: 9003/9003, p2p: 9003/9004/udp)
- op-geth (authrpc: 8551/8553, http: 8545/8546, metrics: 6061/6061, rpc: 30303/30304, ws: 8546/8547)
- op-batcher ()

========= Output =========
- op-geth-enode: enode://3479db4d9217fb5d7a8ed4d61ac36e120b05d36c2eefb795dc42ff2e971f251a2315f5649ea1833271e020b9adc98d5db9973c7ed92d6b2f1f2223088c3d852f@127.0.0.1:30304?discport=0
```

Trailing spaces have also been removed in some places.

Author: therustmonk

crates/op-rbuilder/README.md

@@ -3,7 +3,7 @@
 [![CI status](https://github.com/flashbots/rbuilder/actions/workflows/checks.yaml/badge.svg?branch=develop)](https://github.com/flashbots/rbuilder/actions/workflows/integration.yaml)
 
 
-`op-rbuilder` is a Rust-based block builder designed to build blocks for the Optimism stack. 
+`op-rbuilder` is a Rust-based block builder designed to build blocks for the Optimism stack.
 
 ## Running op-rbuilder
 
@@ -18,7 +18,7 @@ cargo run -p op-rbuilder --bin op-rbuilder --features flashblocks -- node \
     --chain /path/to/chain-config.json \
     --http \
     --authrpc.port 9551 \
-    --authrpc.jwtsecret /path/to/jwt.hex 
+    --authrpc.jwtsecret /path/to/jwt.hex
 ```
 
 To build the op-rbuilder, run:
@@ -29,7 +29,7 @@ cargo build -p op-rbuilder --bin op-rbuilder --features optimism
 
 ## Observability
 
-To verify whether a builder block has landed on-chain, you can add the `--rollup.builder-secret-key` flag or `BUILDER_SECRET_KEY` environment variable. 
+To verify whether a builder block has landed on-chain, you can add the `--rollup.builder-secret-key` flag or `BUILDER_SECRET_KEY` environment variable.
 This will add an additional transaction to the end of the block from the builder key. The transaction will have `Block Number: {}` in the input data as a transfer to the zero address. Ensure that the key has sufficient balance to pay for the transaction at the end of the block.
 
 To enable metrics, set the `--metrics` flag like in [reth](https://reth.rs/run/observability.html) which will expose reth metrics in addition to op-rbuilder metrics. op-rbuilder exposes on-chain metrics via [reth execution extensions](https://reth.rs/developers/exex/exex.html) such as the number of blocks landed and builder balance. Note that the accuracy of the on-chain metrics will be dependent on the sync status of the builder node. There are also additional block building metrics such as:
@@ -87,9 +87,9 @@ go run main.go cook opstack --external-builder http://host.docker.internal:4444
 cargo run -p op-rbuilder --bin op-rbuilder -- node \
     --chain $HOME/.playground/devnet/l2-genesis.json \
     --http --http.port 2222 \
-    --authrpc.port 4444 --authrpc.jwtsecret $HOME/.playground/devnet/jwtsecret \
+    --authrpc.addr 0.0.0.0 --authrpc.port 4444 --authrpc.jwtsecret $HOME/.playground/devnet/jwtsecret \
     --port 30333 --disable-discovery \
-    --metrics 127.0.0.1:9001 \
+    --metrics 127.0.0.1:9011 \
     --rollup.builder-secret-key ac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80 \
     --trusted-peers enode://3479db4d9217fb5d7a8ed4d61ac36e120b05d36c2eefb795dc42ff2e971f251a2315f5649ea1833271e020b9adc98d5db9973c7ed92d6b2f1f2223088c3d852f@127.0.0.1:30304
 ```