Remove unsupported Linux architectures from workflow

Removed support for additional Linux architectures in the publish-release workflow.

Author: liangliangyy

.github/workflows/publish-release.yml

@@ -33,7 +33,4 @@ jobs:
           platforms: |
             linux/amd64
             linux/arm64
-            linux/arm/v7
-            linux/arm/v6
-            linux/386
           tags: ${{ secrets.DOCKERHUB_USERNAME }}/djangoblog:${{ github.event.release.tag_name }}