Build and Push image with SSH support (for private git repositories for instance)

container-image.yml

# make sure you have SSH_PRIVATE_KEY defined in your Github's repository (or organization) secrets
name: Container image

on:
  push:
    branches: [ main ]

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout Repository
        uses: actions/checkout@v3
      - name: Export SSH socket
        uses: webfactory/ssh-agent@v0.5.4
        with:
          ssh-private-key: ${{ secrets.SSH_PRIVATE_KEY }}
      - name: Set up QEMU
        uses: docker/setup-qemu-action@v1
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v1
      - name: Login to GitHub Container Registry
        uses: docker/login-action@v1
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}
      - name: Set image name
        run: echo "image_name=`echo "${{ github.event.repository.full_name }}" | tr '[:upper:]' '[:lower:]'`" >> $GITHUB_ENV
      - name: Build and push
        uses: docker/build-push-action@v2
        with:
          context: .
          ssh: |
            default=${{ env.SSH_AUTH_SOCK }}
          platforms: linux/amd64,linux/arm64
          push: true
          tags: |
            ghcr.io/${{ env.image_name }}:latest
          cache-from: type=gha
          cache-to: type=gha,mode=max