Add Debian package registry (#22854)

Co-authored-by: @awkwardbunny

This PR adds a Debian package registry. You can follow [this
tutorial](https://www.baeldung.com/linux/create-debian-package) to build
a *.deb package for testing. Source packages are not supported at the
moment and I did not find documentation of the architecture "all" and
how these packages should be treated.

---------

Co-authored-by: Brian Hong <brian@hongs.me>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

cmd/migrate_storage_test.go

@@ -25,7 +25,7 @@ func TestMigratePackages(t *testing.T) {
 	creator := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 1})
 
 	content := "package main\n\nfunc main() {\nfmt.Println(\"hi\")\n}\n"
-	buf, err := packages_module.CreateHashedBufferFromReader(strings.NewReader(content), 1024)
+	buf, err := packages_module.CreateHashedBufferFromReaderWithSize(strings.NewReader(content), 1024)
 	assert.NoError(t, err)
 	defer buf.Close()