test docker-compose

Dockerfile

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+#Creates a layer from node:alpine image.
+FROM node:alpine
+
+#Creates directories
+RUN mkdir -p /usr/src/app
+
+#Sets an environment variable
+ENV PORT 3000
+
+#Sets the working directory for any RUN, CMD, ENTRYPOINT, COPY, and ADD commands
+WORKDIR /usr/src/app
+
+#Copy new files or directories into the filesystem of the container
+COPY package.json /usr/src/app
+COPY package-lock.json /usr/src/app
+
+#Execute commands in a new layer on top of the current image and commit the results
+RUN npm install
+
+##Copy new files or directories into the filesystem of the container
+COPY . /usr/src/app
+
+#Execute commands in a new layer on top of the current image and commit the results
+RUN npm run build
+
+#Informs container runtime that the container listens on the specified network ports at runtime
+EXPOSE 3000
+
+#Allows you to configure a container that will run as an executable
+ENTRYPOINT ["npm", "run"]
+