readme: add CI status badged

Signed-off-by: László Várady <[email protected]>

README.md

@@ -6,6 +6,11 @@
   </picture>
 </p>
 
+[![Discord](https://img.shields.io/discord/1082023686028148877?label=Discord&logo=discord&logoColor=white)](https://discord.gg/qmq53uBm2c)
+[![Build Status](https://github.com/axoflow/axosyslog/actions/workflows/devshell.yml/badge.svg)](https://github.com/axoflow/axosyslog/actions/workflows/devshell.yml)
+[![Nightly](https://github.com/axoflow/axosyslog/actions/workflows/nightly-release.yml/badge.svg)](https://github.com/axoflow/axosyslog/actions/workflows/nightly-release.yml)
+[![Binary packages](https://github.com/axoflow/axosyslog/actions/workflows/packages.yml/badge.svg)](https://github.com/axoflow/axosyslog/actions/workflows/packages.yml)
+
 # AxoSyslog - a cloud-native distribution of syslog-ng by Axoflow
 
 This repository contains the cloud-ready syslog-ng images and Helm charts