How is the Docker image build process for applications written in Go language carried out?

To build Docker images of Go applications, a multi-stage build is usually used to obtain a minimal and optimized image.

Main steps:

1. In the first stage (builder), an official image with Go SDK is used, where the application is compiled.
2. In the second stage, a minimal image (for example, based on scratch or alpine) is created, into which only the compiled binary is copied.

Example Dockerfile:

# Build stage
FROM golang:1.20 AS builder
WORKDIR /app
COPY . .
RUN go build -o myapp

# Minimal final image
FROM alpine:latest
RUN apk --no-cache add ca-certificates
COPY --from=builder /app/myapp /usr/local/bin/myapp
ENTRYPOINT ["/usr/local/bin/myapp"]

This approach reduces the size of the final image and excludes unnecessary tools and source code.