Create Dockerfile

Dockerfile

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+# from official image
+FROM ubuntu:18.04
+
+# key-value pairs
+# allow more than one
+#
+LABEL version="1.0"
+
+# install package
+RUN apt-get update
+RUN apt-get install -y curl sudo
+RUN curl -sL https://deb.nodesource.com/setup_16.x | sudo -E bash -
+RUN apt-get install -y nodejs
+
+# set working directory to /app
+WORKDIR /app
+
+# copy index.js from current directory into the container at /app
+COPY . /app
+
+# install need packages specified in package.json
+RUN npm install
+
+# expose port 3000 for acessing the app
+EXPOSE 3000
+
+# This allows Heroku bind its PORT the Apps port
+# since Heroku needs to use its own PORT before the App can be made accessible to the World
+EXPOSE $PORT
+
+# run app when container launches
+CMD ["node", "app.js"]