Code cleaning

Using gofumpt. Add documentation.
Some fixes on type checking and const icon type declaration.

generator/volume.go

@@ -1,9 +1,10 @@
 package generator
 
 import (
-	"katenary/utils"
 	"strings"
 
+	"katenary/utils"
+
 	"github.com/compose-spec/compose-go/types"
 	v1 "k8s.io/api/core/v1"
 	"k8s.io/apimachinery/pkg/api/resource"
@@ -59,7 +60,6 @@ func (v *VolumeClaim) Yaml() ([]byte, error) {
 	}
 	volumeName := v.volumeName
 	out, err := yaml.Marshal(v)
-
 	if err != nil {
 		return nil, err
 	}