Install ag on nodes (#6634) (#6638)

automerge

(cherry picked from commit 7bb224f54a)

net/gce.sh

@@ -718,6 +718,7 @@ $(
     create-solana-user.sh \
     solana-user-authorized_keys.sh \
     add-testnet-solana-user-authorized_keys.sh \
+    install-ag.sh \
     install-certbot.sh \
     install-earlyoom.sh \
     install-libssl-compatability.sh \

net/scripts/install-ag.sh

@@ -0,0 +1,9 @@
+#!/usr/bin/env bash
+#
+set -ex
+
+[[ $(uname) = Linux ]] || exit 1
+[[ $USER = root ]] || exit 1
+
+apt-get update
+apt-get --assume-yes install silversearcher-ag