SetWebhook with custom certificate is broken in 7.x

[valkuc]

Describe the bug OkHttpTelegramClient does not have special implementation for SetWebhook, as result webhook with custom cert is sent as JSON without file content itself.

To Reproduce

try (var is = new ByteArrayInputStream("pem.file")) {
    var webhook = SetWebhook.builder()
            .certificate(new InputFile(is, "certificate"))
            .url("https://url")
            .build();
    new OkHttpTelegramClient("TOKEN").execute(webhook);
} catch (TelegramApiException | IOException e) {
    throw new RuntimeException("Failed to setup webhook", e);
}

or, just try your own example https://github.com/rubenlagus/TelegramBotsExample/blob/master/src/main/java/org/telegram/updateshandlers/WebHookExampleHandlers.java but add custom certificate to SetWebhook.

Expected behavior Certificate file should be sent.

[aNNiMON]

@valkuc try to set webhook option useHttps to true. According to:

https://github.com/rubenlagus/TelegramBots/blame/31832c85d2e58e1f034895390e0d0dfeb2bd58d7/telegrambots-webhook/src/main/java/org/telegram/telegrambots/webhook/TelegramBotsWebhookApplication.java#L159-L169

the SSL plugin for Javalin is only initialized when this flag is enabled.

try (final var webhookApplication = new TelegramBotsWebhookApplication(WebhookOptions.builder().useHttps(true).enableRequestLogging(true).build())) {

[valkuc]

@valkuc try to set webhook option useHttps to true. According to:

https://github.com/rubenlagus/TelegramBots/blame/31832c85d2e58e1f034895390e0d0dfeb2bd58d7/telegrambots-webhook/src/main/java/org/telegram/telegrambots/webhook/TelegramBotsWebhookApplication.java#L159-L169

the SSL plugin for Javalin is only initialized when this flag is enabled.

try (final var webhookApplication = new TelegramBotsWebhookApplication(WebhookOptions.builder().useHttps(true).enableRequestLogging(true).build())) {

I'm not using Javalin part of the project. And I don't need HTTP/HTTPS server functionality (i.e. I don't want for TelegramBots lib to serve HTTPS requests for my bot). I just need the library to make call to Telegram servers and set up a webhook. The only dependency I use is a telegrambots-client. That's it.