[docs] Fixing run permission for pre-build script..

Author: Murilo Marinho

.github/workflows/build_html.yml

@@ -37,6 +37,7 @@ jobs:
       - name: Build HTML Assets
         run: | 
           cd docs/scripts
+          chmod +x pre_build.sh
           ./pre_build.sh
           cd ..
           myst build --html