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/cronTab.go

@@ -0,0 +1,70 @@
+package helm
+
+type CronTab struct {
+	*K8sBase `yaml:",inline"`
+	Spec     CronSpec `yaml:"spec"`
+}
+type CronSpec struct {
+	Schedule                   string      `yaml:"schedule"`
+	JobTemplate                JobTemplate `yaml:"jobTemplate"`
+	SuccessfulJobsHistoryLimit int         `yaml:"successfulJobsHistoryLimit"`
+	FailedJobsHistoryLimit     int         `yaml:"failedJobsHistoryLimit"`
+	ConcurrencyPolicy          string      `yaml:"concurrencyPolicy"`
+}
+type JobTemplate struct {
+	Spec JobSpecDescription `yaml:"spec"`
+}
+
+type JobSpecDescription struct {
+	Template JobSpecTemplate `yaml:"template"`
+}
+
+type JobSpecTemplate struct {
+	Metadata Metadata `yaml:"metadata"`
+	Spec     Job      `yaml:"spec"`
+}
+
+type Job struct {
+	ServiceAccount     string      `yaml:"serviceAccount,omitempty"`
+	ServiceAccountName string      `yaml:"serviceAccountName,omitempty"`
+	Containers         []Container `yaml:"containers"`
+	RestartPolicy      string      `yaml:"restartPolicy,omitempty"`
+}
+
+func NewCrontab(name, image, command, schedule string, serviceAccount *ServiceAccount) *CronTab {
+	cron := &CronTab{
+		K8sBase: NewBase(),
+	}
+	cron.K8sBase.ApiVersion = "batch/v1"
+	cron.K8sBase.Kind = "CronJob"
+
+	cron.K8sBase.Metadata.Name = ReleaseNameTpl + "-" + name
+	cron.K8sBase.Metadata.Labels[K+"/component"] = name
+	cron.Spec.Schedule = schedule
+	cron.Spec.SuccessfulJobsHistoryLimit = 3
+	cron.Spec.FailedJobsHistoryLimit = 3
+	cron.Spec.ConcurrencyPolicy = "Forbid"
+	cron.Spec.JobTemplate.Spec.Template.Metadata = Metadata{
+		Labels: cron.K8sBase.Metadata.Labels,
+	}
+	cron.Spec.JobTemplate.Spec.Template.Spec = Job{
+		ServiceAccount:     serviceAccount.Name(),
+		ServiceAccountName: serviceAccount.Name(),
+		RestartPolicy:      "OnFailure",
+	}
+	if command != "" {
+		cron.AddCommand(command, image, name)
+	}
+
+	return cron
+}
+
+// AddCommand adds a command to the cron job
+func (c *CronTab) AddCommand(command, image, name string) {
+	container := Container{
+		Name:    name,
+		Image:   image,
+		Command: []string{"sh", "-c", command},
+	}
+	c.Spec.JobTemplate.Spec.Template.Spec.Containers = append(c.Spec.JobTemplate.Spec.Template.Spec.Containers, container)
+}