To configure the development environment when using docker/build-push-action, the following steps and examples clarify the necessary options and their implementations.

Step 1: Define Your Dockerfile

Create a Dockerfile that specifies how your application should be built. This example demonstrates a simple Go application:

# syntax=docker/dockerfile:1

FROM golang:1.18 AS builder

WORKDIR /app

COPY go.mod go.sum ./
RUN go mod download

COPY . .

RUN go build -o app ./...

FROM alpine:latest

WORKDIR /root/

COPY --from=builder /app/app .

CMD ["./app"]

This Dockerfile uses a multi-stage build to create a lightweight application image. The Go application is built in the builder stage, and only the final binary is included in the runtime image.

Step 2: Create the GitHub Workflow Configuration

Define your GitHub Actions workflow in a YAML file located at .github/workflows/build-and-push.yml. This example showcases how to utilize docker/build-push-action:

name: Build and Push Docker Image

on:
  push:
    branches:
      - main

jobs:
  build:
    runs-on: ubuntu-latest
    
    steps:
      - name: Checkout Code
        uses: actions/checkout@v2

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1

      - name: Log in to Docker Hub
        uses: docker/login-action@v1
        with:
          username: ${{ secrets.DOCKER_USERNAME }}
          password: ${{ secrets.DOCKER_PASSWORD }}

      - name: Build and Push
        uses: docker/build-push-action@v2
        with:
          context: .
          push: true
          tags: username/repository:latest

Explanation of Workflow Elements:

• Triggering on Push: The workflow is triggered on push events to the main branch.

• Checkout Code: It checks out the code from the repository.

• Set up QEMU: This step configures QEMU, which is necessary for cross-platform builds.

• Setup Buildx: This enables Buildx, a Docker CLI plugin for extended builds.

• Login Action: Securely logs into Docker Hub using credentials stored in GitHub Secrets.

• Build and Push Action: This step builds the Docker image and pushes it to Docker Hub.

Step 3: Configure Go Module

For Go applications, it’s crucial to set the module correctly, ensuring it matches your repository structure. Set the path to github.com/docker/build-push-action/test/go as shown below:

module github.com/docker/build-push-action/test/go

go 1.18

Do not use the -mod=vendor option while building your Go application. This ensures that the builds are consistent with the Go module settings.

Step 4: Integrate Docker Compose (If Necessary)

If your development workflow involves multiple services, a docker-compose.yml can streamline running your application together with its dependencies:

version: '3.8'
services:
  nexus:
    image: sonatype/nexus3:${NEXUS_VERSION:-latest}
    volumes:
      - "./data:/nexus-data"
    ports:
      - "8081:8081"
      - "8082:8082"

This configuration specifies a Nexus service to ensure a private repository is available, managing dependencies if necessary.

Conclusion

The above configurations demonstrate the essential setup for utilizing docker/build-push-action effectively within a development environment focusing on Go applications. The careful arrangement of Docker, GitHub Actions, and Go modules assists in maintaining a streamlined and functional development workflow.

Source: The information provided is based on the configuration practices and examples related to docker/build-push-action.