Show fission deployment version with cli (#538)

Add version information to binary through go ldflags

builder/builder.go

@@ -33,6 +33,8 @@ import (
 	"time"
 
 	"github.com/dchest/uniuri"
+
+	"github.com/fission/fission"
 )
 
 const (
@@ -68,6 +70,11 @@ func MakeBuilder(sharedVolumePath string) *Builder {
 	}
 }
 
+func (builder *Builder) VersionHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	fmt.Fprintf(w, fission.VersionInfo().String())
+}
+
 func (builder *Builder) Handler(w http.ResponseWriter, r *http.Request) {
 	if r.Method != "POST" {
 		e := fmt.Sprintf("Method not allowed: %v", r.Method)