* Pins certificates for `pattern`.
     *
     * @param pattern lower-case host name or wildcard pattern such as `*.example.com`.
     * @param pins SHA-256 or SHA-1 hashes. Each pin is a hash of a certificate's Subject Public Key
     *     Info, base64-encoded and prefixed with either `sha256/` or `sha1/`.
     */
    fun add(
      pattern: String,
      vararg pins: String,
    ) = apply {
      for (pin in pins) {