Merge pull request #2169 from yujunz/loader/go-getter

Replace git cloner with go getter to support various target

api/internal/git/repospec.go

@@ -62,6 +62,11 @@ func (x *RepoSpec) Raw() string {
 	return x.raw
 }
 
+func (x *RepoSpec) WithRaw(s string) *RepoSpec {
+	x.raw = s
+	return x
+}
+
 func (x *RepoSpec) AbsPath() string {
 	return x.Dir.Join(x.Path)
 }