Feat cronjob (#23)

Make possible to declare cronTabs inside docker-compose file.

⇒ Also, add multiple compose file injection with `-c` arguments 

⇒ Also, fixes “ignore depends on” for same pod 

⇒ Also fixes
 
* fix [Be able to specify compose.yml files and its override #21](https://github.com/metal3d/katenary/issues/21)
* fix [Be able to ignore ports to expose in a katenary.io/ports list #16](https://github.com/metal3d/katenary/issues/16)

And more fixes… (later, we will use branches in a better way, that was a hard, long fix process)

helm/serviceAccount.go

@@ -0,0 +1,18 @@
+package helm
+
+// ServiceAccount defines a service account
+type ServiceAccount struct {
+	*K8sBase `yaml:",inline"`
+}
+
+// NewServiceAccount creates a new service account with a given name.
+func NewServiceAccount(name string) *ServiceAccount {
+	sa := &ServiceAccount{
+		K8sBase: NewBase(),
+	}
+	sa.K8sBase.Kind = "ServiceAccount"
+	sa.K8sBase.ApiVersion = "v1"
+	sa.K8sBase.Metadata.Name = ReleaseNameTpl + "-" + name + "-cron-user"
+	sa.K8sBase.Metadata.Labels[K+"/component"] = name
+	return sa
+}