ci(docs): fix examples build error when not rebased fully (#8880)

.github/workflows/compile_docs.yml

@@ -63,13 +63,8 @@ jobs:
         uses: hendrikmuhs/ccache-action@v1
       - name: Build examples (with cache)
         run: |
-          if [ "${{ github.event_name }}" == "pull_request" ]; then
-            REPO_URL="${{ github.event.pull_request.head.repo.clone_url }}"
-            COMMIT_REF="${{ github.event.pull_request.head.sha }}"
-          else
-            REPO_URL="${{ github.server_url }}/${{ github.repository }}"
-            COMMIT_REF="${{ github.sha }}"
-          fi
+          REPO_URL="${{ github.server_url }}/${{ github.repository }}"
+          COMMIT_REF="${{ github.sha }}"
           ./scripts/build_html_examples.sh "$REPO_URL" "$COMMIT_REF"
       - name: Build docs
         run: docs/build.py html

scripts/build_html_examples.sh

@@ -19,6 +19,7 @@ if [ -n "$REPO_URL" ] && [ -n "$COMMIT_REF" ]; then
   echo "Using provided repo URL: $REPO_URL and commit ref: $COMMIT_REF for lvgl submodule"
   git remote set-url origin "$REPO_URL"
   git fetch origin
+  git fetch origin '+refs/pull/*:refs/remotes/origin/pull/*'
   git checkout "$COMMIT_REF"
 else
   CURRENT_REF="$(git rev-parse HEAD)"