Update pkg/build/nodeimage/build.go

Co-authored-by: Antonio Ojea <antonio.ojea.garcia@gmail.com>

pkg/build/nodeimage/build.go

@@ -117,6 +117,11 @@ func Build(options ...Option) error {
 	return ctx.Build()
 }
 
+// detectBuildType detect the type of build required based on the param passed in the following order
+// url: if the param is a valid http or https url
+// file: if the param refers to an existing regular file
+// source: if the param refers to an existing directory
+// release: if the param is a semantic version expression (does this require the v preprended?
 func detectBuildType(param string) string {
 	u, err := url.ParseRequestURI(param)
 	if err == nil {