What are the methods to reduce the size of a Docker image?

Main methods of reducing Docker image size:

• Using minimal base images (e.g., alpine instead of ubuntu).
• Multi-stage builds to include only necessary artifacts in the final image.
• Cleaning cache and temporary files after installing packages (e.g., removing apt cache).
• Combining RUN commands in the Dockerfile to reduce the number of layers.
• Removing unnecessary dependencies and tools after building.

Example of a multi-stage build:

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

FROM alpine
COPY --from=builder /app/myapp /myapp
CMD ["/myapp"]