Replace git pull with fetech and reset

.gitea/workflows/deploy_blog.yml

@@ -19,7 +19,8 @@ jobs:
           git config --global user.email "actions@local"
           git config --global --add safe.directory ${BLOG_FOLDER}
           git submodule update --init --recursive
-          git pull
+          git fetch origin
+          git reset --hard origin/main
 
       - name: Get current Hugo version
         run: echo "current_version=$(${BLOG_FOLDER}/bin/hugo version | grep -oE 'v[0-9]+\.[0-9]+\.[0-9]+')" | tee -a $GITEA_ENV