Try to fix the environment variables... 4th

.github/workflows/build.yml

@@ -46,12 +46,19 @@ jobs:
       matrix:
         extension: [collaborative, websocket]
     name: Build ${{ matrix.extension }} chat extension
+    env:
+      EXTENSION: ${{ matrix.extension }}
 
     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 "DIRECTORY=packages/jupyterlab-ws-chat" || echo "DIRECTORY=packages/jupyterlab-${{ matrix.extension }}-chat" >> $GITHUB_ENV
+        if [ "${EXTENSION}" = "websocket" ]; then
+          echo "PACKAGE=jupyterlab_ws_chat" >> $GITHUB_ENV
+          echo "DIRECTORY=packages/jupyterlab-ws-chat" >> $GITHUB_ENV
+        else
+          echo "PACKAGE=jupyterlab_${EXTENSION}_chat" >> $GITHUB_ENV
+          echo "DIRECTORY=packages/jupyterlab-${EXTENSION}-chat" >> $GITHUB_ENV
+        fi
         echo $GITHUB_ENV
 
     - name: Checkout
@@ -66,21 +73,21 @@ jobs:
     - name: Build package
       run:  |
         jlpm install
-        jlpm build:${{ matrix.extension }}
+        jlpm build:${EXTENSION}
 
-    - name: Package $PACKAGE
-      working-directory: $DIRECTORY
+    - name: Package ${PACKAGE}
+      working-directory: ${DIRECTORY}
       run: |
         set -eux
         pip install build
         python -m build
-        pip uninstall -y "$PACKAGE" jupyterlab
+        pip uninstall -y "${PACKAGE}" jupyterlab
 
-    - name: Upload $PACKAGE package
+    - name: Upload ${PACKAGE} package
       uses: actions/upload-artifact@v3
       with:
         name: package-artifacts
-        path: $DIRECTORY/dist/$PACKAGE*
+        path: ${DIRECTORY}/dist/${PACKAGE}*
         if-no-files-found: error
 
   check_links: