feat: add sync-at-startup CLI arg

Author: greged93

.github/workflows/test.yaml

@@ -73,7 +73,7 @@ jobs:
           ALCHEMY_KEY: ${{ secrets.ALCHEMY_KEY }}
         run: |
           cargo run --bin rollup-node --features serde --release -- \
-            node --chain scroll-sepolia --datadir=./l2reth --disable-discovery 
+            node --chain scroll-sepolia --datadir=./l2reth --disable-discovery \
             --http --http.addr=0.0.0.0 --http.port=8545 --http.api eth \
             --trusted-peers enode://29cee709c400533ae038a875b9ca975c8abef9eade956dcf3585e940acd5c0ae916968f514bd37d1278775aad1b7db30f7032a70202a87fd7365bd8de3c9f5fc@44.242.39.33:30303 \
             --log.stdout.format log-fmt -vvv \

crates/node/src/args.rs

@@ -194,7 +194,7 @@ impl ScrollRollupNodeConfig {
             chain_spec.clone(),
             Some(l2_provider),
             fcs,
-            !self.test && !chain_spec.is_dev_chain(),
+            self.engine_driver_args.sync_at_startup && !self.test && !chain_spec.is_dev_chain(),
             self.engine_driver_args.en_sync_trigger,
             Duration::from_millis(self.sequencer_args.payload_building_duration),
         );
@@ -308,6 +308,9 @@ pub struct EngineDriverArgs {
     /// at which the engine driver triggers optimistic sync.
     #[arg(long = "engine.en-sync-trigger", default_value_t = constants::BLOCK_GAP_TRIGGER)]
     pub en_sync_trigger: u64,
+    /// Whether the engine driver should try to sync at start up.
+    #[arg(long = "engine.sync-at-startup", num_args=0..=1, default_value_t = true)]
+    pub sync_at_startup: bool,
 }
 
 /// The network arguments.