fix: fix AMI in dcv instance userdata (#3)

* Add build-essential to EFS utils installation

* Update machine image name in dcv_stack.py

Author: ebalp

training/gr00t/infra/configure_dcv_instance.sh

@@ -291,7 +291,7 @@ must "install-aws-cli-v2" '
 # 9) amazon-efs-utils (critical for EFS mount)
 must "install-efs-utils" '
   apt_update
-  apt_install git binutils rustc cargo pkg-config libssl-dev ca-certificates cmake golang-go
+  apt_install git binutils rustc cargo pkg-config libssl-dev ca-certificates cmake golang-go build-essential
   rm -rf /tmp/efs-utils
   git clone --branch v2.4.0 --single-branch https://github.com/aws/efs-utils /tmp/efs-utils
   cd /tmp/efs-utils

training/gr00t/infra/dcv_stack.py

@@ -136,7 +136,7 @@ def __init__(
             # Recommended: 2xlarge for running simulation, 4xlarge if also running policy inference
             instance_type=ec2.InstanceType("g6.4xlarge"),
             machine_image=ec2.MachineImage.lookup(
-                name="ubuntu/images/hvm-ssd/ubuntu-jammy-22.04-amd64-server-*",
+                name="ubuntu/images/hvm-ssd/ubuntu-jammy-22.04-amd64-server-20251111",
                 owners=["099720109477"],
             ),
             vpc=resolved_vpc,