Add support for passing in docker labels.

This add to `services.labels` to the compatibility file and maps the labels to the ECS provided DockerLabels.

Signed-off-by: Jonathan Woodell <jwoodell@snapattack.com>

ecs/compatibility.go

@@ -84,6 +84,7 @@ var compatibleComposeAttributes = []string{
 	"services.healthcheck.timeout",
 	"services.image",
 	"services.init",
+	"services.labels",
 	"services.logging",
 	"services.logging.options",
 	"services.networks",

ecs/convert.go

@@ -115,6 +115,7 @@ func (b *ecsAPIService) createTaskDefinition(project *types.Project, service typ
 		DependsOnProp:          dependencies,
 		DnsSearchDomains:       service.DNSSearch,
 		DnsServers:             service.DNS,
+		DockerLabels:           service.Labels,
 		DockerSecurityOptions:  service.SecurityOpt,
 		EntryPoint:             service.Entrypoint,
 		Environment:            pairs,