Dockerfile

# syntax=docker/dockerfile:1 

# Defining the base image layer from which the container will be build, in our case golang as we are using Go to setup the server.
# I got image from Docker hub Official Images webpage. https://hub.docker.com/_/golang
FROM golang:1.16.10-alpine

# Default port value
ARG GO_SERVER_PORT=3030

# Creating a default directory to live inside the container 
WORKDIR /go-web-server

# Copying root dependencies file provided (module) into the app directory within the image
COPY go.mod ./

RUN go mod download

# Copying our source code into the app directory within the image and build it 
COPY main.go ./
RUN go build -o /go-web-server

EXPOSE ${GO_SERVER_PORT}

CMD [ "/go-web-server/go-web-server" ]

Hi Kim!

I wrote some comments to show my thoughts during the process. I did not know if I should write them as I saw on the directions to write the Dockerfile as if the container would be used in production. Hope it is okay :)