GitHub Actions: also test with Node.js 16.x

Author: striezel

.dockerignore

@@ -1,5 +1,7 @@
 # Git directory and Node.js modules
 .git
 */node_modules/
+# GitHub Actions workflow
+.github/
 # Don't copy generated images.
 */*.png

.github/workflows/node.js.yml

@@ -8,12 +8,14 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [8.x, 10.x, 12.x, 14.x]
+        node-version: [8.x, 10.x, 12.x, 14.x, 16.x]
 
     steps:
     - uses: actions/checkout@v2
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v1
       with:
         node-version: ${{ matrix.node-version }}
+    - name: Display version information
+      run: node --version && npm --version
     - run: cd "$GITHUB_WORKSPACE"/export-server && npm install