feat: use docker buildx build

refs #1989

Signed-off-by: Carlos Alexandro Becker <caarlos0@gmail.com>

.goreleaser.yml

@@ -38,6 +38,7 @@ dockers:
   - 'goreleaser/goreleaser:{{ .Tag }}-amd64'
   - 'ghcr.io/goreleaser/goreleaser:{{ .Tag }}-amd64'
   dockerfile: Dockerfile
+  use_buildx: true
   binaries:
   - goreleaser
   build_flag_templates:
@@ -54,6 +55,7 @@ dockers:
   - 'goreleaser/goreleaser:{{ .Tag }}-arm64'
   - 'ghcr.io/goreleaser/goreleaser:{{ .Tag }}-arm64'
   dockerfile: Dockerfile
+  use_buildx: true
   binaries:
   - goreleaser
   build_flag_templates:

internal/pipe/docker/docker.go

@@ -169,7 +169,7 @@ func process(ctx *context.Context, docker config.Docker, bins []*artifact.Artifa
 		return err
 	}
 
-	if err := dockerBuild(ctx, tmp, images, buildFlags); err != nil {
+	if err := dockerBuild(ctx, tmp, images, buildFlags, docker.Buildx); err != nil {
 		return err
 	}
 
@@ -256,10 +256,10 @@ func link(src, dest string) error {
 	})
 }
 
-func dockerBuild(ctx *context.Context, root string, images, flags []string) error {
-	log.WithField("image", images[0]).Info("building docker image")
+func dockerBuild(ctx *context.Context, root string, images, flags []string, buildx bool) error {
+	log.WithField("image", images[0]).WithField("buildx", buildx).Info("building docker image")
 	/* #nosec */
-	var cmd = exec.CommandContext(ctx, "docker", buildCommand(images, flags)...)
+	var cmd = exec.CommandContext(ctx, "docker", buildCommand(buildx, images, flags)...)
 	cmd.Dir = root
 	log.WithField("cmd", cmd.Args).WithField("cwd", cmd.Dir).Debug("running")
 	out, err := cmd.CombinedOutput()
@@ -270,8 +270,11 @@ func dockerBuild(ctx *context.Context, root string, images, flags []string) erro
 	return nil
 }
 
-func buildCommand(images, flags []string) []string {
+func buildCommand(buildx bool, images, flags []string) []string {
 	base := []string{"build", "."}
+	if buildx {
+		base = []string{"buildx", "build", "."}
+	}
 	for _, image := range images {
 		base = append(base, "-t", image)
 	}

internal/pipe/docker/docker_test.go

@@ -847,6 +847,7 @@ func TestBuildCommand(t *testing.T) {
 	tests := []struct {
 		name   string
 		flags  []string
+		buildx bool
 		expect []string
 	}{
 		{
@@ -864,11 +865,16 @@ func TestBuildCommand(t *testing.T) {
 			flags:  []string{"--label=foo", "--build-arg=bar=baz"},
 			expect: []string{"build", ".", "-t", images[0], "-t", images[1], "--label=foo", "--build-arg=bar=baz"},
 		},
+		{
+			name:   "buildx",
+			buildx: true,
+			flags:  []string{"--label=foo", "--build-arg=bar=baz"},
+			expect: []string{"buildx", "build", ".", "-t", images[0], "-t", images[1], "--label=foo", "--build-arg=bar=baz"},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-			command := buildCommand(images, tt.flags)
-			require.Equal(t, tt.expect, command)
+			require.Equal(t, tt.expect, buildCommand(tt.buildx, images, tt.flags))
 		})
 	}
 }

pkg/config/config.go

@@ -494,6 +494,7 @@ type Docker struct {
 	SkipPush           string   `yaml:"skip_push,omitempty"`
 	Files              []string `yaml:"extra_files,omitempty"`
 	BuildFlagTemplates []string `yaml:"build_flag_templates,omitempty"`
+	Buildx             bool     `yaml:"use_buildx,omitempty"`
 }
 
 // DockerManifest config.

www/docs/customization/docker.md

@@ -80,6 +80,11 @@ dockers:
     # Path to the Dockerfile (from the project root).
     dockerfile: Dockerfile
 
+    # Wether to use `docker buildx build` instead of `docker build`.
+    # You probably want to set it to true when using flags like `--platform`.
+    # Defaults to false.
+    use_buildx: true
+
     # Template of the docker build flags.
     build_flag_templates:
     - "--pull"
@@ -88,6 +93,7 @@ dockers:
     - "--label=org.opencontainers.image.revision={{.FullCommit}}"
     - "--label=org.opencontainers.image.version={{.Version}}"
     - "--build-arg=FOO={{.Env.Bar}}"
+    - "--platform=linux/arm64"
 
     # If your Dockerfile copies files other than the binary itself,
     # you should list them here as well.
@@ -105,6 +111,9 @@ dockers:
 !!! tip
     Learn more about the [name template engine](/customization/templates/).
 
+!!! tip
+    You can also create multi-platform images using the [docker_manifests](/customization/docker_manifest/) config.
+
 These settings should allow you to generate multiple Docker images,
 for example, using multiple `FROM` statements,
 as well as generate one image for each binary in your project.