Split latest and tagged buildx actions

Reduces redundancy with builds when creating a tag

.github/workflows/buildx.yml

@@ -26,6 +26,7 @@ jobs:
           echo "${{ secrets.DOCKER_PASSWORD }}" | \
             docker login -u "${{ secrets.DOCKER_USERNAME }}" --password-stdin
       - name: build and push the image
+        if: startsWith(github.ref, 'refs/heads/main')
         run: |
           docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
           docker buildx ls