Revert "Add Debian package registry" (#24412)

Reverts go-gitea/gitea#22854

models/migrations/v1_20/v256.go

@@ -1,23 +0,0 @@
-// Copyright 2023 The Gitea Authors. All rights reserved.
-// SPDX-License-Identifier: MIT
-
-package v1_20 //nolint
-
-import (
-	"xorm.io/xorm"
-)
-
-func AddIsInternalColumnToPackage(x *xorm.Engine) error {
-	type Package struct {
-		ID               int64  `xorm:"pk autoincr"`
-		OwnerID          int64  `xorm:"UNIQUE(s) INDEX NOT NULL"`
-		RepoID           int64  `xorm:"INDEX"`
-		Type             string `xorm:"UNIQUE(s) INDEX NOT NULL"`
-		Name             string `xorm:"NOT NULL"`
-		LowerName        string `xorm:"UNIQUE(s) INDEX NOT NULL"`
-		SemverCompatible bool   `xorm:"NOT NULL DEFAULT false"`
-		IsInternal       bool   `xorm:"INDEX NOT NULL DEFAULT false"`
-	}
-
-	return x.Sync2(new(Package))
-}