Build staging site with correct url

.drone.yml

@@ -7,13 +7,26 @@ name: default
 steps:
   - name: build
     image: plugins/hugo
-    settings:
+    settings: &build-settings
       extended: yes
       validate: yes
+    when:
+      branch:
+        exclude:
+          - staging
+
+  - name: build-staging
+    image: plugins/hugo
+    settings:
+      <<: *build-settings
+      url: https://staging.www.franconian.net/
+    when:
+      branch:
+        - staging
 
   - name: deploy-staging
     image: appleboy/drone-scp
-    settings: &settings
+    settings: &deploy-settings
       host: dragon.luj0ga.de
       username: www
       key:
@@ -33,7 +46,7 @@ steps:
   - name: deploy
     image: appleboy/drone-scp
     settings:
-      <<: *settings
+      <<: *deploy-settings
       target: /srv/www/sites/www.franconian.net/
     when:
       event: