docs: comment

.github/workflows/build-docker.yml

@@ -131,6 +131,9 @@ jobs:
       # Adapted from https://docs.docker.com/build/ci/github-actions/multi-platform/
       - name: Create manifest list and push
         working-directory: /tmp/digests
+        # The jq command expands the docker/metadata json "tags" array entry to `-t tag1 -t tag2 ...` for each tag in the array
+        # The printf will expand the base image with the `<UV_BASE_IMG>@sha256:<sha256> ...` for each sha256 in the directory
+        # The final command becomes `docker buildx imagetools create -t tag1 -t tag2 ... <UV_BASE_IMG>@sha256:<sha256_1> <UV_BASE_IMG>@sha256:<sha256_2> ...`
         run: |
           docker buildx imagetools create \
             $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \