Fix some RPM registry flaws (#28782)

Related #26984
(https://github.com/go-gitea/gitea/pull/26984#issuecomment-1889588912)

Fix admin cleanup message.
Fix models `Get` not respecting default values.
Rebuild RPM repository files after cleanup.
Do not add RPM group to package version name.
Force stable sorting of Alpine/Debian/RPM repository data.
Fix missing deferred `Close`.
Add tests for multiple RPM groups.
Removed non-cached `ReplaceAllStringRegex`.

If there are multiple groups available, it's stated in the package
installation screen:

![grafik](8f132760-882c-4ab8-9678-77e47dfc4415)

modules/packages/rpm/metadata.go

@@ -15,7 +15,10 @@ import (
 )
 
 const (
-	PropertyMetadata  = "rpm.metadata"
+	PropertyMetadata     = "rpm.metadata"
+	PropertyGroup        = "rpm.group"
+	PropertyArchitecture = "rpm.architecture"
+
 	SettingKeyPrivate = "rpm.key.private"
 	SettingKeyPublic  = "rpm.key.public"
 

modules/templates/util_string.go

@@ -4,7 +4,6 @@
 package templates
 
 import (
-	"regexp"
 	"strings"
 
 	"code.gitea.io/gitea/modules/base"
@@ -26,10 +25,6 @@ func (su *StringUtils) Contains(s, substr string) bool {
 	return strings.Contains(s, substr)
 }
 
-func (su *StringUtils) ReplaceAllStringRegex(s, regex, new string) string {
-	return regexp.MustCompile(regex).ReplaceAllString(s, new)
-}
-
 func (su *StringUtils) Split(s, sep string) []string {
 	return strings.Split(s, sep)
 }

modules/util/slice.go

@@ -4,6 +4,7 @@
 package util
 
 import (
+	"cmp"
 	"slices"
 	"strings"
 )
@@ -45,3 +46,10 @@ func SliceSortedEqual[T comparable](s1, s2 []T) bool {
 func SliceRemoveAll[T comparable](slice []T, target T) []T {
 	return slices.DeleteFunc(slice, func(t T) bool { return t == target })
 }
+
+// Sorted returns the sorted slice
+// Note: The parameter is sorted inline.
+func Sorted[S ~[]E, E cmp.Ordered](values S) S {
+	slices.Sort(values)
+	return values
+}