docker-registry scale down

Platform services configuration were changed in order to consume
minimal resources by limiting number of threads/workers to the
minimum value based on docker-registry service documentation

TEST PLAN:
PASS: AIO-SX: build a new Debian ISO. Install, boostrap and
perform a host-unlock verifying expected number of threads
created.

Story: 2010087
Task: 45707
Change-Id: I8dd10b5d3d9c8d7e7886996a620d4b776c45c980
Signed-off-by: Thiago Antonio Miranda <tmarques@windriver.com>

puppet-manifests/src/modules/platform/manifests/dockerdistribution.pp

@@ -154,6 +154,19 @@ class platform::dockerdistribution::config
     mode    => '0644',
     content => template('platform/docker-distribution-override.conf.erb'),
   }
+
+  if $::platform::params::system_type == 'All-in-one' and
+    $::platform::params::distributed_cloud_role != 'systemcontroller' {
+    $docker_registry_max_procs = $::platform::params::eng_workers
+
+    file { "/etc/systemd/system/${service_name}.d/docker-distribution-stx-override.conf":
+      ensure  => file,
+      content => template('platform/docker-distribution-stx-override.conf.erb'),
+      owner   => 'root',
+      group   => 'root',
+      mode    => '0644',
+    }
+  }
 }
 
 # compute also needs the "insecure" flag in order to deploy images from

puppet-manifests/src/modules/platform/templates/docker-distribution-stx-override.conf.erb

@@ -0,0 +1,2 @@
+[Service]
+Environment="GOMAXPROCS=<%= @docker_registry_max_procs %>"