use node 14 for building

Author: lobsterkatie

.github/workflows/build.yml

@@ -79,7 +79,8 @@ jobs:
       - name: Set up Node
         uses: actions/setup-node@v1
         with:
-          node-version: ${{ env.DEFAULT_NODE_VERSION }}
+          # ember won't build under node 16, at least not with the versions of the ember build tools we use
+          node-version: '14'
       - name: Check dependency cache
         uses: actions/cache@v2
         with: