Node: Fix volumes syntax error on docker-amd64-mbed-tls-host

Signed-off-by: Arthur She <arthur.she@linaro.org>
Change-Id: I8c8ec4bfd337bbe63db521fa0b81e33026a1e605
diff --git a/docker_templates_amd64.yml b/docker_templates_amd64.yml
index e765660..9b21ca9 100644
--- a/docker_templates_amd64.yml
+++ b/docker_templates_amd64.yml
@@ -46,5 +46,5 @@
   labels: 'docker-amd64-mbed-tls-focal-host'
   launch_method: 'launch_ssh'
   ssh: !include docker_ssh_buildslave.yml
-  volumes: '/data/shared:/srv/shared:rw /var/run/docker.sock:/var/run/docker.sock'
+  volumes: !include mbed_tls_host_docker_vol.yml
   max_instances: '20'
diff --git a/mbed_tls_host_docker_vol.yml b/mbed_tls_host_docker_vol.yml
new file mode 100644
index 0000000..dcf3232
--- /dev/null
+++ b/mbed_tls_host_docker_vol.yml
@@ -0,0 +1,2 @@
+'/data/shared:/srv/shared:rw
+\n/var/run/docker.sock:/var/run/docker.sock'