Drop Node 12 which is EOL. CI Build on 14 and 16

.github/workflows/build.yml

@@ -22,7 +22,7 @@ jobs:
     strategy:
       # Create a matrix of Node versions to test against (in parallel)
       matrix:
-        node-version: [12.x, 14.x]
+        node-version: [14.x, 16.x]
       # Do NOT exit immediately if one matrix job fails
       fail-fast: false
     # These are the actual CI steps to perform per job
@@ -82,11 +82,11 @@ jobs:
         run: yarn run test:headless
 
       # NOTE: Angular CLI only supports code coverage for specs. See https://github.com/angular/angular-cli/issues/6286
-      # Upload coverage reports to Codecov (for Node v12 only)
+      # Upload coverage reports to Codecov (for one version of Node only)
       # https://github.com/codecov/codecov-action
       - name: Upload coverage to Codecov.io
         uses: codecov/codecov-action@v2
-        if: matrix.node-version == '12.x'
+        if: matrix.node-version == '16.x'
 
       # Using docker-compose start backend using CI configuration
       # and load assetstore from a cached copy