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develop: Update multi-stage example to use go mod (#17829) 

Signed-off-by: Chris Crone <christopher.crone@docker.com>
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Chris Crone 2023-07-26 19:14:47 -04:00 committed by GitHub
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develop/develop-images/dockerfile_best-practices.md
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@ -237,19 +237,18 @@ A Dockerfile for a Go application could look like:
```dockerfile
# syntax=docker/dockerfile:1
FROM golang:1.16-alpine AS build
FROM golang:{{site.example_go_version}}-alpine AS build
# Install tools required for project
# Run `docker build --no-cache .` to update dependencies
RUN apk add --no-cache git
RUN go get github.com/golang/dep/cmd/dep
# List project dependencies with Gopkg.toml and Gopkg.lock
# List project dependencies with go.mod and go.sum
# These layers are only re-built when Gopkg files are updated
COPY Gopkg.lock Gopkg.toml /go/src/project/
WORKDIR /go/src/project/
COPY go.mod go.sum /go/src/project/
# Install library dependencies
RUN dep ensure -vendor-only
RUN go mod download
# Copy the entire project and build it
# This layer is rebuilt when a file changes in the project directory