ci: Correct docs publishing

.github/workflows/publish-docs.yml

@@ -4,26 +4,19 @@
 name: publish-docs
 on:
   push:
-    branches: [main]
+    branches: [docs]
   workflow_dispatch:
 jobs:
   deploy:
     name: Deploy documentation
     runs-on: ubuntu-22.04
+    container:
+      image: ghcr.io/pulp-platform/snitch_cluster:main
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/setup-python@v2
-        with:
-          python-version: 3.x
       - uses: mattnotmitt/doxygen-action@v1
         with:
           working-directory: sw/
-      - name: bender install
-        uses: pulp-platform/pulp-actions/bender-install@v2
-        with:
-          version: 0.27.1
-      - name: Install Python requirements
-        run: pip install -r python-requirements.txt
       - name: Generate runtime documentation
         # yamllint disable rule:line-length
         run: |