Undo changes to ci.yml not done in this PR

.github/workflows/ci.yml

@@ -17,22 +17,35 @@ jobs:
       github.event.pull_request.draft != true &&
       (github.event_name == 'pull_request_review' && github.event.review.state == 'approved') ||
       github.event_name != 'pull_request_review'
+    strategy:
+      matrix:
+        node-version:
+        - "16"
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v2
 
-    - name: Set up Node.js
-      uses: actions/setup-node@v4
-      with:
-        node-version: 20
+    - name: Install Node.js ${{ matrix.node-version }}
+      shell: bash -l {0}
+      run: |
+        nvm install --default ${{ matrix.node-version }}
+        dirname "$(npm which)" >> "$GITHUB_PATH"
 
     - name: Install Node.js dependencies
       run: npm install
 
+    - name: List environment
+      id: list_env
+      shell: bash
+      run: |
+        echo "node@$(node -v)"
+        echo "npm@$(npm -v)"
+        npm -s ls
+
     - name: Run tests
       shell: bash
       run: npm test
-
+    
     - name: Check Docker support
       shell: bash
       run: |