Use the Docker log driver for syslog

* When a syslog endpoint is provided, it currently launches a logspout
  container to gather and send the logs
* This instead adds the syslog-address, using the syslog driver. If both
  cloudfront logs is set to true, and a syslog endpoint is specified,
  syslog will take precedence (As only 1 can be specified)
* If this works as expected, we can remove logspout

container-definitions/app.json.tpl

@@ -2,6 +2,14 @@
   {
     "image": "${image}",
     "name": "${container_name}",
+    %{ if syslog_address != "" }
+    "logConfiguration": {
+      "logDriver": "syslog",
+      "options": {
+        "syslog-address": "${syslog_address}"
+      }
+    },
+    ${else}
     %{ if cloudwatch_log_group != "" }
     "logConfiguration": {
       "logDriver": "awslogs",
@@ -18,6 +26,7 @@
       "logDriver": "json-file"
     },
     %{ endif }
+    %{ endif }
     %{ if volumes != "[]" }
     "mountPoints": ${volumes},
     %{ endif }

ecs-cluster-infrastructure-service.tf

@@ -242,6 +242,7 @@ resource "aws_ecs_task_definition" "infrastructure_ecs_cluster_service" {
       linux_parameters = each.value["enable_execute_command"] == true ? jsonencode({
         initProcessEnabled = true
       }) : "{}"
+      syslog_address        = local.infrastructure_ecs_cluster_syslog_endpoint
       cloudwatch_log_group  = each.value["enable_cloudwatch_logs"] == true ? aws_cloudwatch_log_group.infrastructure_ecs_cluster_service[each.key].name : ""
       awslogs_stream_prefix = ""
       region                = local.aws_region