setup-buildx-action/docs/advanced/install-default.md

Install by default

If you want set up the docker build command as an alias to docker buildx build:

name: ci

on:
  push:

jobs:
  buildx:
    runs-on: ubuntu-latest
    steps:
      -
        name: Checkout
        uses: actions/checkout@v3
      -
        name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v2
        with:
          install: true
      -
        name: Build
        run: |
                    docker build . # will run buildx