Add build status badge

Author: yacoob

README.md

@@ -1,2 +1,4 @@
+[![Build and push image to GitHub Container Registry](https://github.com/yacoob/beets-container/actions/workflows/oci.yml/badge.svg)](https://github.com/yacoob/beets-container/actions/workflows/oci.yml)
+
 My zsh config with beets.io installed, so I don't need to edit the path in
 beetsdb again, and again whenever I move the music dir.