fix: set dockers.goarm to 6 by default (#3552)

fixes #3545

Signed-off-by: Carlos A Becker <caarlos0@users.noreply.github.com>

internal/pipe/docker/docker.go

@@ -47,6 +47,9 @@ func (Pipe) Default(ctx *context.Context) error {
 		if docker.Goarch == "" {
 			docker.Goarch = "amd64"
 		}
+		if docker.Goarm == "" {
+			docker.Goarm = "6"
+		}
 		if docker.Goamd64 == "" {
 			docker.Goamd64 = "v1"
 		}

internal/pipe/docker/docker_test.go

@@ -1182,6 +1182,7 @@ func TestDefault(t *testing.T) {
 	docker := ctx.Config.Dockers[0]
 	require.Equal(t, "linux", docker.Goos)
 	require.Equal(t, "amd64", docker.Goarch)
+	require.Equal(t, "6", docker.Goarm)
 	require.Equal(t, []string{"aa"}, docker.IDs)
 	require.Equal(t, useDocker, docker.Use)
 	docker = ctx.Config.Dockers[1]

www/docs/customization/docker.md

@@ -50,18 +50,23 @@ dockers:
     id: myimg
 
     # GOOS of the built binaries/packages that should be used.
+    # Default: `linux`.
     goos: linux
 
     # GOARCH of the built binaries/packages that should be used.
+    # Default: `amd64`.
     goarch: amd64
 
     # GOARM of the built binaries/packages that should be used.
+    # Default: `6`.
     goarm: ''
 
     # GOAMD64 of the built binaries/packages that should be used.
+    # Default: `v1`.
     goamd64: 'v2'
 
     # IDs to filter the binaries/packages.
+    # Default: `empty`.
     ids:
     - mybuild
     - mynfpm