doh

Author: Rich-Harris

.github/workflows/docs-preview-create.yml

@@ -14,7 +14,7 @@ jobs:
       - name: Set env vars
         run: |
           echo "BRANCH=preview/$ID" >> $GITHUB_ENV
-          echo "SLUG=preview/$(echo ${ID//\//})" >> $GITHUB_ENV
+          echo "SLUG=preview-$(echo ${ID//\//})" >> $GITHUB_ENV
 
       - uses: actions/checkout@v4
         with: