Add a target to build RPMs.

There an option to create a `deb` distribution package, but no RPMs.

Checking the documentation on the packaging plugin, this is an one line
change on the `build.gradle.kts` file.

Author: bogado

app/build.gradle.kts

@@ -70,7 +70,7 @@ compose.desktop {
 
         nativeDistributions{
             modules("jdk.jdi", "java.compiler", "jdk.accessibility", "jdk.zipfs", "java.management.rmi", "java.scripting", "jdk.httpserver")
-            targetFormats(TargetFormat.Dmg, TargetFormat.Msi, TargetFormat.Deb)
+            targetFormats(TargetFormat.Dmg, TargetFormat.Msi, TargetFormat.Deb, TargetFormat.Rpm)
             packageName = "Processing"