Using this docker file you will reduce your golang docker image from ~1GB to ~40MB and you will rebuild your image faster
# Stage 1: Build the Go application
FROM golang:1.23-alpine AS builder
# Set the working directory inside the container
WORKDIR /app
# Copy the Go module files
COPY go.mod go.sum ./
# Download Go module dependencies
RUN go mod download
# Copy the rest of the application code
COPY . .
# Build the Go application
RUN go build -o main cmd/server/main.go
# Stage 2: Minimal image for running the app
FROM alpine:latest as runner
# Set environment variables (optional)
ENV GO_ENV=production
# Create a directory for the application
WORKDIR /app
# Copy the binary from the builder stage
COPY --from=builder /app/main .
# Expose the port on which the application runs (if applicable)
EXPOSE 8080
# Command to run the application
CMD ["./main"]