fix: use README template with sed

.gitea/workflows/update-readme.yaml

@@ -14,12 +14,20 @@ jobs:
           git clone http://gitea-http:3000/${{ github.repository }}.git .
           git checkout ${{ github.ref_name }}
 
+
       - name: Update README
         run: |
           LOC=$(grep '"total_code"' public/code-stats.json | sed 's/[^0-9]*//g')
-          export FORMATTED_LOC=$(printf "%'d" $LOC)
+          FORMATTED_LOC=$(printf "%'d" $LOC)
           
-          envsubst < README.template > README.md
+          echo "Injecting $FORMATTED_LOC into README.template..."
+
+          sed "s/REPLACE_ME_LOC/$FORMATTED_LOC/g" README.template > README.md
+
+          if [ ! -s README.md ]; then
+            echo "Error: README.md is empty!"
+            exit 1
+          fi
 
       - name: Commit and Push
         run: |