Add contract build step

testnet/genesis.go

@@ -9,6 +9,7 @@ import (
 	"math"
 	"math/big"
 	"os"
+	"os/exec"
 	"path/filepath"
 	"time"
 
@@ -303,6 +304,16 @@ func Main(cliCtx *cli.Context) error {
 		return fmt.Errorf("failed to create L2 genesis: %w", err)
 	}
 
+	log.Info("Building Optimism contracts")
+	cmd := exec.Command("forge", "build")
+	cmd.Dir = "./lib/optimism/packages/contracts-bedrock"
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	err = cmd.Run()
+	if err != nil {
+		return fmt.Errorf("failed to build contracts: %w", err)
+	}
+
 	foundryArtifacts := foundry.OpenArtifactsDir("./lib/optimism/packages/contracts-bedrock/forge-artifacts")
 	sourceMap := foundry.NewSourceMapFS(os.DirFS("./lib/optimism/packages/contracts-bedrock"))
 	l2Host := createL2(log.Root(), foundryArtifacts, sourceMap, &config, l2Genesis.Timestamp)