E2E - starting dockerfile

Dockerfile

## specify node version
FROM quay.io/netguru/ng-node:6 as builder    # First 'FROM', as builder is used as reference below

## add necessary environments
ENV NODE_ENV staging                         # Set env var

## add code & build app
ADD . $APP_HOME                              # Copy / add external source to image's filesystem
RUN yarn install                             # Install all dependencies for frontend app
RUN yarn build                               # Compile frontend build

## Real app image
FROM nginx:alpine as app                     # Second 'FROM', now it's multi-stage build file

## Copy build/ folder to new image
COPY --from=builder /app/build /app/dist     # Copy file from one image to another by reference - we will have to get rid of it
COPY nginx.conf /etc/nginx/nginx.conf        # Copy nginx config to nginx directory

EXPOSE 3000                                  # Container will listen on this port at runtime