runtime/builder with golang implementation (#2003)

runtime/builder/options.go

@@ -0,0 +1,26 @@
+package builder
+
+// Options to use when building source
+type Options struct {
+	// Archive used, e.g. tar
+	Archive string
+	// Entrypoint to use, e.g. foo/main.go
+	Entrypoint string
+}
+
+// Option configures one or more options
+type Option func(o *Options)
+
+// Archive sets the builders archive
+func Archive(a string) Option {
+	return func(o *Options) {
+		o.Archive = a
+	}
+}
+
+// Entrypoint sets the builders entrypoint
+func Entrypoint(e string) Option {
+	return func(o *Options) {
+		o.Entrypoint = e
+	}
+}