Update README.md

[hyperglue]

we need to use docker buildx, otherwise it fails

[hyperglue]

it fails with

Step 15/16 : RUN --mount=type=secret,id=PREPARE_SAMPLES,mode=0444 ./prepare_samples.sh
the --mount option requires BuildKit. Refer to https://docs.docker.com/go/buildkit/ to learn how to build images with BuildKit enabled

[fabiogra]

Right, but with only that command it won't work.
I used
docker buildx build --load -t moseca .

also makes sense to update the run command

docker run -it --rm -p 7860:7860 moseca