let consumer app overwrite this

Author: Schmarvinius

cds-feature-attachments/src/main/java/com/sap/cds/feature/attachments/configuration/AttachmentsEnvironmentPostProcessor.java

@@ -39,7 +39,7 @@ public void postProcessEnvironment(
       for (PropertySource<?> source : sources) {
         // Use addLast() to let the consuming app OVERRIDE your list.
         // Use addFirst() to FORCE your list over the consuming app.
-        environment.getPropertySources().addFirst(source);
+        environment.getPropertySources().addLast(source);
         System.out.println(
             "[AttachmentsEnvironmentPostProcessor] Added property source: " + source.getName());