ci: Update hugo.yml

Author: myrkvi

.github/workflows/hugo.yml

@@ -52,6 +52,7 @@ jobs:
         env:
           HUGO_CACHEDIR: ${{ runner.temp }}/hugo_cache
           HUGO_ENVIRONMENT: production
+          HUGO_DISCOURSE_TOKEN: ${{ secrets.HUGO_DISCOURSE_TOKEN }}
         run: |
           hugo \
             --minify \