Try to fix the environment variables... 3rd

.github/workflows/build.yml

@@ -50,9 +50,10 @@ jobs:
     steps:
     - name: Create variables
       run: |
-        [ "${{ matrix.extension }}" = "websocket" ] && echo "PACKAGE=jupyterlab-ws-chat" || echo "PACKAGE=jupyterlab-${{ matrix.extension }}-chat" >> $GITHUB_ENV
+        [ "${{ matrix.extension }}" = "websocket" ] && echo "PACKAGE=jupyterlab_ws_chat" || echo "PACKAGE=jupyterlab_${{ matrix.extension }}_chat" >> $GITHUB_ENV
         [ "${{ matrix.extension }}" = "websocket" ] && echo "DIRECTORY=packages/jupyterlab-ws-chat" || echo "DIRECTORY=packages/jupyterlab-${{ matrix.extension }}-chat" >> $GITHUB_ENV
         echo $GITHUB_ENV
+
     - name: Checkout
       uses: actions/checkout@v3
 
@@ -67,19 +68,19 @@ jobs:
         jlpm install
         jlpm build:${{ matrix.extension }}
 
-    - name: Package ${{ env.PACKAGE }}
-      working-directory: ${{ env.DIRECTORY }}
+    - name: Package $PACKAGE
+      working-directory: $DIRECTORY
       run: |
         set -eux
         pip install build
         python -m build
-        pip uninstall -y "${{ env.PACKAGE }}" jupyterlab
+        pip uninstall -y "$PACKAGE" jupyterlab
 
-    - name: Upload ${{ env.PACKAGE }} package
+    - name: Upload $PACKAGE package
       uses: actions/upload-artifact@v3
       with:
         name: package-artifacts
-        path: ${{ env.DIRECTORY }}/dist/${{ env.PACKAGE }}*
+        path: $DIRECTORY/dist/$PACKAGE*
         if-no-files-found: error
 
   check_links: