feat(deploy): set timeout via label (!290)

Solves coop-cloud/organising#437

A timeout can be specified globally for a recipe using this label:
`coop-cloud.${STACK_NAME}.timeout=${TIMEOUT:-120}`. This sets the default timeout to 120s. An app specific timeout can be set using the env `TIMEOUT`.

Co-authored-by: Moritz <moritz.m@local-it.org>
Reviewed-on: coop-cloud/abra#290

pkg/config/app.go

@@ -544,3 +544,29 @@ func SetUpdateLabel(compose *composetypes.Config, stackName string, appEnv AppEn
 		}
 	}
 }
+
+// GetLabel reads docker labels in the format of "coop-cloud.${STACK_NAME}.${LABEL}" from the local compose files
+func GetLabel(compose *composetypes.Config, stackName string, label string) string {
+	for _, service := range compose.Services {
+		if service.Name == "app" {
+			labelKey := fmt.Sprintf("coop-cloud.%s.%s", stackName, label)
+			logrus.Debugf("get label '%s'", labelKey)
+			if labelValue, ok := service.Deploy.Labels[labelKey]; ok {
+				return labelValue
+			}
+		}
+	}
+	logrus.Debugf("no %s label found for %s", label, stackName)
+	return ""
+}
+
+// GetTimeoutFromLabel reads the timeout value from docker label "coop-cloud.${STACK_NAME}.TIMEOUT" and returns 50 as default value
+func GetTimeoutFromLabel(compose *composetypes.Config, stackName string) (int, error) {
+	var timeout = 50 // Default Timeout
+	var err error = nil
+	if timeoutLabel := GetLabel(compose, stackName, "timeout"); timeoutLabel != "" {
+		logrus.Debugf("timeout label: %s", timeoutLabel)
+		timeout, err = strconv.Atoi(timeoutLabel)
+	}
+	return timeout, err
+}