arm64_download script waits for VM to boot before finishing.

platform_tools/barelinux/bin/arm64_download

Index: platform_tools/barelinux/bin/arm64_download
diff --git a/platform_tools/barelinux/bin/arm64_download b/platform_tools/barelinux/bin/arm64_download
index b43873c943e992ec23df1f4cd7a9246ef70f925d..3b3b0a5390260572af99d5f4555bef9088f558de 100755
--- a/platform_tools/barelinux/bin/arm64_download
+++ b/platform_tools/barelinux/bin/arm64_download
@@ -118,6 +118,12 @@ start_arm64_image() {
         --network-nat-subnet="192.168.31.0/24" \
         --network-nat-ports="8022=22" \
         > /dev/null 2>&1 &
+    echo 'Waiting for foundation model to boot...'
+    while ! ssh -i "${working_dir}/key" \
+        -o NoHostAuthenticationForLocalhost=yes \
+        -p 8022 user@localhost true 2> /dev/null; do
+        sleep 5
+    done
     echo 'Listening to SSH on port 8022.'
 }