Update docker-build.yml

.github/workflows/docker-build.yml

@@ -53,5 +53,5 @@ jobs:
           push: true
           tags: |
             ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:alpine
-            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:alpine-{{date 'YYYYMMDD'}}
-          labels: ${{ steps.meta.outputs.labels }} 
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:alpine-${TAG_DATE}
+          labels: ${{ steps.meta.outputs.labels }}