component/provision: Make components purgable

pkg/errorx/errorx.go

@@ -0,0 +1,11 @@
+package errorx
+
+// First returns the first non-nil error, or nil otherwise.
+func First(errors ...error) error {
+	for _, err := range errors {
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}