build on GH CI instead of our own (ARM) runner (#161)

Author: kkohbrok

.github/workflows/docker_build_and_upload.yml

@@ -17,7 +17,7 @@ env:
 # There is a single job in this workflow. It's configured to run on the latest available version of Ubuntu.
 jobs:
   build-and-push-image:
-    runs-on: [self-hosted, linux, ARM64]
+    runs-on: ubuntu-latest
     # Sets the permissions granted to the `GITHUB_TOKEN` for the actions in this job.
     permissions:
       contents: read