Add Delay Option for Genesis to Prysmctl (#12878)

* add delay option to prysmctl for genesis time

* revert bazel

cmd/prysmctl/testnet/generate_genesis.go

@@ -34,6 +34,7 @@ var (
 		ConfigName         string
 		NumValidators      uint64
 		GenesisTime        uint64
+		GenesisTimeDelay   uint64
 		OutputSSZ          string
 		OutputJSON         string
 		OutputYaml         string
@@ -99,6 +100,11 @@ var (
 				Destination: &generateGenesisStateFlags.GenesisTime,
 				Usage:       "Unix timestamp seconds used as the genesis time in the genesis state. If unset, defaults to now()",
 			},
+			&cli.Uint64Flag{
+				Name:        "genesis-time-delay",
+				Destination: &generateGenesisStateFlags.GenesisTimeDelay,
+				Usage:       "Delay genesis time by N seconds",
+			},
 			&cli.BoolFlag{
 				Name:        "override-eth1data",
 				Destination: &generateGenesisStateFlags.OverrideEth1Data,
@@ -223,6 +229,9 @@ func generateGenesis(ctx context.Context) (state.BeaconState, error) {
 		f.GenesisTime = uint64(time.Now().Unix())
 		log.Info("No genesis time specified, defaulting to now()")
 	}
+	log.Infof("Delaying genesis %v by %v seconds", f.GenesisTime, f.GenesisTimeDelay)
+	f.GenesisTime += f.GenesisTimeDelay
+	log.Infof("Genesis is now %v", f.GenesisTime)
 
 	v, err := version.FromString(f.ForkName)
 	if err != nil {
@@ -266,8 +275,8 @@ func generateGenesis(ctx context.Context) (state.BeaconState, error) {
 		//gen.Config.CancunTime = interop.GethCancunTime(f.GenesisTime, params.BeaconConfig())
 		gen.Config.CancunTime = interop.GethCancunTime(f.GenesisTime, params.BeaconConfig())
 		log.
-			WithField("shanghai", gen.Config.ShanghaiTime).
-			WithField("cancun", gen.Config.CancunTime).
+			WithField("shanghai", fmt.Sprintf("%d", *gen.Config.ShanghaiTime)).
+			WithField("cancun", fmt.Sprintf("%d", *gen.Config.CancunTime)).
 			Info("setting fork geth times")
 		if v > version.Altair {
 			// set ttd to zero so EL goes post-merge immediately