Fix publish-docs workflow

Updates publish_docs.yml to skip configure-pages action and the deploy step in personal forks so
the workflow can succeed.

Signed-off-by: Winford <winford@object.stream>

Author: UncleGrumpy

.github/workflows/publish_docs.yml

@@ -32,6 +32,7 @@ jobs:
       uses: actions/checkout@v5
 
     - name: "Setup Pages"
+      if: ${{ github.repository == 'atomvm/atomvm_rebar3_plugin' }}
       uses: actions/configure-pages@v5
 
     - name: "Build Docs"
@@ -46,6 +47,7 @@ jobs:
         path: ./docs
 
   deploy:
+    if: ${{ github.repository == 'atomvm/atomvm_rebar3_plugin' }}
     # Add a dependency to the build job
     needs: build
 
@@ -62,6 +64,5 @@ jobs:
         uses: actions/configure-pages@v5
 
       - name: Deploy to GitHub Pages
-        if: ${{ github.repository == 'atomvm/atomvm_rebar3_plugin' }}
         id: deployment
         uses: actions/deploy-pages@v4