fix(docs-ci): install nodejs in python image — actions/checkout needs node

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.forgejo/workflows/docs.yml

@@ -15,10 +15,10 @@ jobs:
       volumes:
         - /srv/docs-makerfloss/html:/output
     steps:
-      - name: Install git for actions/checkout
+      - name: Install git, rsync, nodejs for actions/checkout
         run: |
           apt-get update -qq
-          apt-get install -y --no-install-recommends git rsync
+          apt-get install -y --no-install-recommends git rsync nodejs
 
       - name: Checkout repository
         uses: actions/checkout@v4