we should be using imagetools, not pull and tag

Author: anarchivist

.github/workflows/build.yml

@@ -165,6 +165,9 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
 
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v3
         with:
@@ -184,7 +187,6 @@ jobs:
 
       - name: Retag and push the image
         run: |
-          docker pull "$DOCKER_APP_IMAGE"
-          docker inspect "$DOCKER_APP_IMAGE"
-          echo "$DOCKER_METADATA_OUTPUT_TAGS" | tr ' ' '\n' | xargs -n1 docker tag "$DOCKER_APP_IMAGE"
-          docker push --all-tags "$(echo "$DOCKER_APP_IMAGE" | cut -f1 -d:)"
+          docker buildx imagetools create \
+            $(jq -cr '.tags | map("--tag " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
+            "$(echo "$DOCKER_APP_IMAGE" | cut -f1 -d:)"