Add RPM registry (#23380)

Fixes #20751

This PR adds a RPM package registry. You can follow [this
tutorial](https://opensource.com/article/18/9/how-build-rpm-packages) to
build a *.rpm package for testing.

This functionality is similar to the Debian registry (#22854) and
therefore shares some methods. I marked this PR as blocked because it
should be merged after #22854.


![grafik](https://user-images.githubusercontent.com/1666336/223806549-d8784fd9-9d79-46a2-9ae2-f038594f636a.png)

models/packages/package.go

@@ -44,6 +44,7 @@ const (
 	TypeNuGet     Type = "nuget"
 	TypePub       Type = "pub"
 	TypePyPI      Type = "pypi"
+	TypeRpm       Type = "rpm"
 	TypeRubyGems  Type = "rubygems"
 	TypeSwift     Type = "swift"
 	TypeVagrant   Type = "vagrant"
@@ -64,6 +65,7 @@ var TypeList = []Type{
 	TypeNuGet,
 	TypePub,
 	TypePyPI,
+	TypeRpm,
 	TypeRubyGems,
 	TypeSwift,
 	TypeVagrant,
@@ -100,6 +102,8 @@ func (pt Type) Name() string {
 		return "Pub"
 	case TypePyPI:
 		return "PyPI"
+	case TypeRpm:
+		return "RPM"
 	case TypeRubyGems:
 		return "RubyGems"
 	case TypeSwift:
@@ -141,6 +145,8 @@ func (pt Type) SVGName() string {
 		return "gitea-pub"
 	case TypePyPI:
 		return "gitea-python"
+	case TypeRpm:
+		return "gitea-rpm"
 	case TypeRubyGems:
 		return "gitea-rubygems"
 	case TypeSwift: