Another publish script fix

Author: yoannchaudet

.github/workflows/publish-gem.yml

@@ -18,5 +18,7 @@ jobs:
         run: |
           gem build github-pages.gemspec
       - name: Publish gem
+        env:
+          GEM_HOST_API_KEY: ${{ secrets.PAGES_GEM_PUBLISH }}  
         run: |
-          gem push github-pages-*.gem --key ${{ secrets.PAGES_GEM_PUBLISH }}
+          gem push github-pages-*.gem