fix: multi-value query params for vAPI methods

vAPI methods can have multi-value query params, but the vapi/rest.Resource helper was setting to a single value.

vapi/rest/resource.go

@@ -52,7 +52,7 @@ func (r *Resource) WithAction(action string) *Resource {
 func (r *Resource) WithParam(name string, value string) *Resource {
 	// ParseQuery handles empty case, and we control access to query string so shouldn't encounter an error case
 	params, _ := url.ParseQuery(r.u.RawQuery)
-	params[name] = []string{value}
+	params[name] = append(params[name], value)
 	r.u.RawQuery = params.Encode()
 	return r
 }

vapi/rest/resource_test.go

@@ -42,5 +42,12 @@ func TestResource_WithParam(t *testing.T) {
 		if !strings.Contains(url.String(), expectedPath) {
 			t.Errorf("Param incorrectly updated on resource, URL %q, expected path %q", url.String(), expectedPath)
 		}
+
+		url = c.Resource("api/some/resource")
+		url = url.WithParam("names", "foo").WithParam("names", "bar")
+		expectedPath = "api/some/resource?names=foo&names=bar"
+		if !strings.Contains(url.String(), expectedPath) {
+			t.Errorf("Param incorrectly updated on resource, URL %q, expected path %q", url.String(), expectedPath)
+		}
 	})
 }