Add signature support for the RPM module (#27069)

close  #27031

If the rpm package does not contain a matching gpg signature, the
installation will fail. See (#27031) , now auto-signing rpm uploads.

This option is turned off by default for compatibility.

modules/setting/packages.go

@@ -42,6 +42,8 @@ var (
 		LimitSizeRubyGems    int64
 		LimitSizeSwift       int64
 		LimitSizeVagrant     int64
+
+		DefaultRPMSignEnabled bool
 	}{
 		Enabled:              true,
 		LimitTotalOwnerCount: -1,
@@ -97,6 +99,7 @@ func loadPackagesFrom(rootCfg ConfigProvider) (err error) {
 	Packages.LimitSizeRubyGems = mustBytes(sec, "LIMIT_SIZE_RUBYGEMS")
 	Packages.LimitSizeSwift = mustBytes(sec, "LIMIT_SIZE_SWIFT")
 	Packages.LimitSizeVagrant = mustBytes(sec, "LIMIT_SIZE_VAGRANT")
+	Packages.DefaultRPMSignEnabled = sec.Key("DEFAULT_RPM_SIGN_ENABLED").MustBool(false)
 	return nil
 }