add back linux/arm64

Author: brendan-kellam

.github/workflows/ghcr-publish.yml

@@ -1,9 +1,7 @@
 name: Publish to ghcr
 
-# This workflow uses actions that are not certified by GitHub.
-# They are provided by a third-party and are governed by
-# separate terms of service, privacy policy, and support
-# documentation.
+# This workflow is a modification of a example.
+# @ see: https://docs.docker.com/build/ci/github-actions/multi-platform/#distribute-build-across-multiple-runners
 
 on:
   # schedule:
@@ -32,8 +30,7 @@ jobs:
       matrix:
         platform:
           - linux/amd64
-          # @todo: enable arm64 later
-          # - linux/arm64
+          - linux/arm64
 
     steps:
       - name: Prepare