Remove temporary comments in Drone configuration

.drone.yml

@@ -64,9 +64,9 @@ steps:
 
 - name: backend_build
   image: rust
-  #temp when:
-  #temp   event:
-  #temp     - tag
+  when:
+    event:
+      - tag
   volumes:
   - name: rust_registry
     path: /usr/local/cargo/registry
@@ -108,9 +108,9 @@ steps:
   volumes:
   - name: release
     path: /tmp/release
-  #temp when:
-  #temp   event:
-  #temp     - tag
+    when:
+      event:
+        - tag
   commands:
   - cd moneymgr_mobile
   - flutter --disable-analytics