remove multi-archs from CI workflow as its only needed for publishing

Author: mtrezza

.github/workflows/ci.yml

@@ -86,7 +86,7 @@ jobs:
         uses: docker/build-push-action@v2
         with:
           context: .
-          platforms: linux/amd64, linux/arm/v6, linux/arm/v7, linux/arm64/v8
+          platforms: linux/amd64
   check-lock-file-version:
     name: NPM Lock File Version
     timeout-minutes: 5