Update Dockerfile to install stable node/npm versions

.ddev/web-build/Dockerfile

@@ -1,3 +1,4 @@
 ARG BASE_IMAGE
 FROM $BASE_IMAGE
-RUN apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y -o Dpkg::Options::="--force-confold" --no-install-recommends --no-install-suggests jpegoptim optipng gifsicle
+RUN npm i -g n && n stable
+RUN npm i -g npm

.github/workflows/deploy.yaml

@@ -34,9 +34,9 @@ jobs:
             ${{ runner.os }}-
 
       - name: Build assets
-        uses: actions/setup-node@v1
+        uses: actions/setup-node@v2
         with:
-          node-version: 12.x
+          node-version: '14'
 
       - run: npm install
       - run: npm run build