Fixup scripts to set up a new CI node (#9348)

* Clean up node setup scripts for new CI boxes

* Move files under ci directory

* Set CUDA env var to setup cuda drivers

* Fixup and add README

* shellcheck

* Apply review feedback, rename dir and setup files

Co-authored-by: publish-docs.sh <maintainers@solana.com>

ci/setup-new-buildkite-agent/setup-partner-node.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+HERE="$(dirname "$0")"
+
+# shellcheck source=ci/setup-new-buildkite-agent/utils.sh
+source "$HERE"/utils.sh
+
+ensure_env || exit 1
+
+set -ex
+
+"$HERE"/disable-nouveau.sh
+"$HERE"/disable-networkd-wait.sh
+"$HERE"/setup-grub.sh
+"$HERE"/setup-cuda.sh
+"$HERE"/setup-procfs-knobs.sh
+"$HERE"/setup-limits.sh
+
+PASSWORD="$(dd if=/dev/urandom bs=1 count=9 status=none | base64)"
+echo "$PASSWORD"
+chpasswd <<< "solana:$PASSWORD"
+