Refactorisation and improvements

- image of container is now splitted in repository and tag (in values
  and deployment). The "tag" is tested in deployment
- add "chart-version" option

Code:

- globalize the PVC generation
- ensure types for environment values
- refactored to make generic the container creation in a deployment
- avoiding race condition on ServiceConfig by using a copy (then a
  pointer of this copy)

generator/writers/storage.go

@@ -2,6 +2,7 @@ package writers
 
 import (
 	"katenary/helm"
+	"log"
 	"os"
 	"path/filepath"
 
@@ -14,12 +15,18 @@ func BuildStorage(storage *helm.Storage, name, templatesDir string) {
 	name = storage.Metadata.Labels[helm.K+"/component"]
 	pvcname := storage.Metadata.Labels[helm.K+"/pvc-name"]
 	fname := filepath.Join(templatesDir, name+"-"+pvcname+"."+kind+".yaml")
-	fp, _ := os.Create(fname)
+	fp, err := os.Create(fname)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer fp.Close()
 	volname := storage.K8sBase.Metadata.Labels[helm.K+"/pvc-name"]
 
 	fp.WriteString("{{ if .Values." + name + ".persistence." + volname + ".enabled }}\n")
 	enc := yaml.NewEncoder(fp)
 	enc.SetIndent(IndentSize)
-	enc.Encode(storage)
+	if err := enc.Encode(storage); err != nil {
+		log.Fatal(err)
+	}
 	fp.WriteString("{{- end -}}")
 }