Use real types to parse labels

We were using `yaml.Unmarshal` on basic types or inline structs. This
was not efficient and not clear to defined what we expect in labels.
We now use types to unmarshal the labels.

Only the `values` label is, at this time, parsed by GetValuesFromLabel
because this `utils` function is clearly a special case.

generator/labelStructs/configMap.go

@@ -1,8 +1,13 @@
-package labelstructs
+package labelStructs
 
-type CronJob struct {
-	Image    string `yaml:"image,omitempty"`
-	Command  string `yaml:"command"`
-	Schedule string `yaml:"schedule"`
-	Rbac     bool   `yaml:"rbac"`
+import "gopkg.in/yaml.v3"
+
+type ConfigMapFile []string
+
+func ConfigMapFileFrom(data string) (ConfigMapFile, error) {
+	var mapping ConfigMapFile
+	if err := yaml.Unmarshal([]byte(data), &mapping); err != nil {
+		return nil, err
+	}
+	return mapping, nil
 }