fix(ci): temporary workaround for preview deletion (#834)

Related: Codeberg/Documentation#818, git-pages/git-pages-cli#44

May be reverted once the upstream issue is fixed.

Reviewed-on: https://codeberg.org/Codeberg/Documentation/pulls/834
Reviewed-by: Gusted <gusted@noreply.codeberg.org>

.woodpecker/delete-preview.yaml

@@ -2,6 +2,11 @@ when:
   - event: pull_request_closed
 
 steps:
+  create-empty-dir:
+    image: alpine
+    commands:
+      - mkdir _empty
+      
   delete-preview:
     image: codeberg.org/gedankenstuecke/git-pages-woodpecker-plugin@sha256:5257561a95054104f7499838817f3b447049a1edc14e87b99156b1302e0bce36
     settings:
@@ -9,7 +14,8 @@ steps:
       PATH: pull_${CI_COMMIT_PULL_REQUEST}
       TOKEN:
         from_secret: surge_forge_token
-      DELETE: true
+      UPLOAD_DIR: _empty
+    depends_on: create-empty-dir
 
   comment:
     image: mcs94/gitea-comment@sha256:f1a06366bfa34ff7594f369ebf81cbadd2d4410b7d51c9aa59c0c0264aa5fbd9