Introduce option multi-dist to the publish commands

This change makes it possible to publish multiple distributions
with packages named the same but with different content by changing
structure of the generated pool hierarchy. The option not enabled
by default as this changes the structure of the output which could
break the expectations of other tools.

cmd/publish_switch.go

@@ -14,6 +14,7 @@ func aptlyPublishSwitch(cmd *commander.Command, args []string) error {
 	var err error
 
 	components := strings.Split(context.Flags().Lookup("component").Value.String(), ",")
+	multiDist := context.Flags().Lookup("multi-dist").Value.Get().(bool)
 
 	if len(args) < len(components)+1 || len(args) > len(components)+2 {
 		cmd.Usage()
@@ -100,7 +101,7 @@ func aptlyPublishSwitch(cmd *commander.Command, args []string) error {
 		published.SkipBz2 = context.Flags().Lookup("skip-bz2").Value.Get().(bool)
 	}
 
-	err = published.Publish(context.PackagePool(), context, collectionFactory, signer, context.Progress(), forceOverwrite)
+	err = published.Publish(context.PackagePool(), context, collectionFactory, signer, context.Progress(), forceOverwrite, multiDist)
 	if err != nil {
 		return fmt.Errorf("unable to publish: %s", err)
 	}
@@ -161,6 +162,7 @@ This command would switch published repository (with one component) named ppa/wh
 	cmd.Flag.String("component", "", "component names to update (for multi-component publishing, separate components with commas)")
 	cmd.Flag.Bool("force-overwrite", false, "overwrite files in package pool in case of mismatch")
 	cmd.Flag.Bool("skip-cleanup", false, "don't remove unreferenced files in prefix/component")
+	cmd.Flag.Bool("multi-dist", false, "enable multiple packages with the same filename in different distributions")
 
 	return cmd
 }