Add a build package (#1926)

* Add a build package

* fix go mod

* package tar

build/tar/tar.go

@@ -0,0 +1,45 @@
+// Package tar basically tarballs source code
+package tar
+
+import (
+	"os"
+	"path/filepath"
+
+	"github.com/micro/go-micro/v3/build"
+)
+
+type tarBuild struct{}
+
+func (t *tarBuild) Package(name string, src *build.Source) (*build.Package, error) {
+	pkg := name + ".tar.gz"
+	// path to the tarball
+	path := filepath.Join(os.TempDir(), src.Path, pkg)
+
+	// create a temp directory
+	if err := os.MkdirAll(filepath.Join(os.TempDir(), src.Path), 0755); err != nil {
+		return nil, err
+	}
+
+	if err := Compress(src.Path, path); err != nil {
+		return nil, err
+	}
+
+	return &build.Package{
+		Name:   name,
+		Path:   path,
+		Type:   t.String(),
+		Source: src,
+	}, nil
+}
+
+func (t *tarBuild) Remove(b *build.Package) error {
+	return os.Remove(b.Path)
+}
+
+func (t *tarBuild) String() string {
+	return "tar.gz"
+}
+
+func NewBuild(opts ...build.Option) build.Build {
+	return new(tarBuild)
+}