fix(cmd): use pointer instead a copied object of the configFile environment

cmd/convert/convert.go

@@ -9,7 +9,7 @@ import (
 )
 
 var compression bool
-var configFile string
+var configFile *string
 
 var convertCmd = &cobra.Command{
 	Use:     "convert",
@@ -37,7 +37,7 @@ var convertCmd = &cobra.Command{
 }
 
 // Execute a
-func InitCmd(cmd *cobra.Command, cnfFile string) {
+func InitCmd(cmd *cobra.Command, cnfFile *string) {
 	configFile = cnfFile
 	cmd.AddCommand(convertCmd)
 	convertCmd.Flags().BoolVar(&compression, "compression", true, "Compress measured values")