add ci step for europe

.github/workflows/build.yml

@@ -90,6 +90,11 @@ jobs:
           echo "REPORTS_COMMIT_MSG=$( git log --format=%s ${GITHUB_SHA} )" >> $GITHUB_ENV
           cp sa2.map gh-pages/maps/${GITHUB_SHA}.map
 
+      - name: Europe
+        run: |
+          make clean
+          make europe -j${nproc}
+
       - name: Update reports
         if: ${{ github.event_name == 'push' }}
         uses: EndBug/add-and-commit@v7