Migrate to GitHub Container Registry

from GitHub Packages
https://docs.github.com/en/free-pro-team@latest/packages/getting-started-with-github-container-registry/migrating-to-github-container-registry-for-docker-images

.drone.yml

@@ -20,10 +20,10 @@ steps:
 - name: squid-armhf image for github packages
   image: plugins/docker
   settings:
-    repo: docker.pkg.github.com/b4tman/docker-squid/squid-armhf
+    repo: ghcr.io/b4tman/squid-armhf
     auto_tag: true
     pull_image: true
-    registry: docker.pkg.github.com
+    registry: ghcr.io
     username: b4tman
     password:
       from_secret: github_password