cmd/keeper: disable GC for zkvm execution

ZKVMs are constrained environments that liberally allocate memory and
never release it. In this context, using the GC is only going to cause
issues down the road, and slow things down in any case.

cmd/keeper/main.go

@@ -19,6 +19,7 @@ package main
 import (
 	"fmt"
 	"os"
+	"runtime/debug"
 
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/stateless"
@@ -35,6 +36,10 @@ type Payload struct {
 	Witness *stateless.Witness
 }
 
+func init() {
+	debug.SetGCPercent(-1) // Disable garbage collection
+}
+
 func main() {
 	input := getInput()
 	var payload Payload