Running your application in docker container is the first step towards production. We have to make sure that our app can build successfully , independently of our local environment.
Bellow you can find a basic dockerfile for your angular application that uses nginx server to render the html.

FROM node:12-alpine as build

WORKDIR /app

COPY package.json .

RUN yarn install

COPY . .

RUN apk add gettext

RUN yarn build --base-href

FROM nginx:latest

COPY --from=build /app/dist/hr-frontend /usr/share/nginx/html

EXPOSE 80

The above dockerfile will run your application on port 80.
To test it, in the root of your project run:

1. docker image build --tag <your image name> .
2. docker run -d -p 8000:80 <your image name> This command will serve your application on port 8000. The port 80 is where your application is running inside the container.
3. Go to localhost:8000 .