fix typo

Author: harisont

.github/workflows/build-binary-packages.yml

@@ -49,7 +49,7 @@ jobs:
         
     - name: Build package
       run: |
-        export $PYTHONPATH="/home/runner/work/gf-core/gf-core/debian/gf/usr/local/lib/python3.12/dist-packages/"
+        export PYTHONPATH="/home/runner/work/gf-core/gf-core/debian/gf/usr/local/lib/python3.12/dist-packages/"
         make deb
 
     - name: Copy package