Install nodejs in Dockerfile

Dockerfile

@@ -23,6 +23,9 @@ FROM ${BUILDER_IMAGE} as builder
 
 # install build dependencies
 RUN apt-get update -y && apt-get install -y build-essential git \
+    && apt-get install -y curl \
+    && curl -sL https://deb.nodesource.com/setup_16.x | bash \
+    && apt-get install -y nodejs \
     && apt-get clean && rm -f /var/lib/apt/lists/*_*
 
 # prepare build dir
@@ -46,12 +49,19 @@ RUN mkdir config
 COPY config/config.exs config/${MIX_ENV}.exs config/
 RUN mix deps.compile
 
+# install npm dependencies
+COPY assets/package.json assets/package-lock.json ./assets/
+RUN npm --prefix ./assets ci --progress=false --no-audit --loglevel=error
+
 COPY priv priv
 
 COPY lib lib
 
 COPY assets assets
 
+# Install NPM dependencies
+RUN npm install --prefix assets
+
 # compile assets
 RUN mix assets.deploy