chore: add github action status badge for self-test test

Author: starpit

README.md

@@ -1,6 +1,7 @@
 [![CLI Tests](https://github.com/project-codeflare/codeflare-cli/actions/workflows/cli.yml/badge.svg)](https://github.com/project-codeflare/codeflare-cli/actions/workflows/cli.yml)
 [![UI Tests](https://github.com/project-codeflare/codeflare-cli/actions/workflows/ui.yml/badge.svg)](https://github.com/project-codeflare/codeflare-cli/actions/workflows/ui.yml)
 [![Kube Tests](https://github.com/project-codeflare/codeflare-cli/actions/workflows/kind.yml/badge.svg)](https://github.com/project-codeflare/codeflare-cli/actions/workflows/kind.yml)
+[![Self-test Tests](https://github.com/project-codeflare/codeflare-cli/actions/workflows/self-test.yml/badge.svg)](https://github.com/project-codeflare/codeflare-cli/actions/workflows/self-test.yml)
 
 # CodeFlare Desktop Client