chore: stop pushing the :latest image tag on release (#7428)

Author: zhxiaogg

.github/workflows/docker.yml

@@ -106,12 +106,6 @@ jobs:
           	--amend $IMAGE_NAME:$TAG-arm64
           docker manifest push $IMAGE_NAME:$TAG
 
-          docker manifest create \
-          	$IMAGE_NAME:latest            \
-          	--amend $IMAGE_NAME:$TAG-amd64   \
-          	--amend $IMAGE_NAME:$TAG-arm64
-          docker manifest push $IMAGE_NAME:latest
-
   cd-to-dev-env:
     # This job deploys the latest main commit to the dev environment
     if: github.repository == 'grafana/tempo' && github.ref == 'refs/heads/main'