FROM golang:1.21 as build # Set destination for COPY WORKDIR /app # Download Go modules COPY go.mod go.sum ./ RUN go mod download # Copy the source code. Note the slash at the end, as explained in # https://docs.docker.com/engine/reference/builder/#copy COPY . ./ # Build RUN CGO_ENABLED=0 GOOS=linux go build -o /listy FROM alpine COPY --from=build /listy /listy # Optional: # To bind to a TCP port, runtime parameters must be supplied to the docker command. # But we can document in the Dockerfile what ports # the application is going to listen on by default. # https://docs.docker.com/engine/reference/builder/#expose EXPOSE 5001 # Run CMD ["/listy"]