fix(linux): Add missing RPM signature (#12786)

Author: kandrelczyk

.changes/rpm-signature.md

@@ -0,0 +1,5 @@
+---
+'tauri-cli': 'patch:enhance'
+---
+
+Added RPM to the list of package types for which signature file will be generated. 

crates/tauri-cli/src/bundle.rs

@@ -213,6 +213,7 @@ fn sign_updaters(
           | PackageType::WindowsMsi
           | PackageType::AppImage
           | PackageType::Deb
+          | PackageType::Rpm
       )
     })
     .collect();