Add multiarch builds for raspberry pi.

README.md

@@ -5,6 +5,8 @@ Produce working, minimal Docker image for the Telegram Bot API server together w
 to use pipeline generating builds on the changes within the main repository managed by
 Telegram team.
 
+This project does not modify any part of the [tdlib/telegram-bot-api](https://github.com/tdlib/telegram-bot-api) code.
+
 ## Build schedule
 Build will be triggered automatically once a week to produce the latest version of the Telegram API Server.
 I would set it for the daily release but every build takes ~25 minutes and generates additional costs on my side.
@@ -12,8 +14,12 @@ Images are versioned in format `1.0.x` where `x` is a build number.
 
 ## How to use the image
 
+Images created within this project support following architectures: AMD64 and ARM64
+
+Yes, it means you can run them on *Raspberry Pi 4* and above as well! 🥳
+
 ### Github authentication
-You need to authenticate with github [see this thread](https://github.community/t/docker-pull-from-public-github-package-registry-fail-with-no-basic-auth-credentials-error/16358/87) to pull even the publicly available images. To do so you need to create [Personal Access Token](https://github.com/settings/tokens/new) with `read:packages` scope and use it to authenticate your docker client with the Github Docker Registry.
+You need to authenticate with github ([see this thread](https://github.community/t/docker-pull-from-public-github-package-registry-fail-with-no-basic-auth-credentials-error/16358/87)) to pull even the publicly available images. To do so you need to create [Personal Access Token](https://github.com/settings/tokens/new) with `read:packages` scope and use it to authenticate your docker client with the Github Docker Registry.
 
 ```
 docker login -u $GITHUB_USERNAME -p $GITHUB_TOKEN docker.pkg.github.com