I'm one of the maintainers of img but I have to admit that I don't have enough bandwidth to maintain img.

I'd suggest using the upstream BuildKit directly: https://github.com/moby/buildkit
BuildKit also provides a helper script for (pseudo-)daemonless mode: https://github.com/moby/buildkit/blob/master/examples/buildctl-daemonless/buildctl-daemonless.sh

Usage: https://github.com/moby/buildkit#daemonless

# rootful
docker run \
    -it \
    --rm \
    --privileged \
    -v /path/to/dir:/tmp/work \
    --entrypoint buildctl-daemonless.sh \
    moby/buildkit:master \
        build \
        --frontend dockerfile.v0 \
        --local context=/tmp/work \
        --local dockerfile=/tmp/work

# rootless
docker run \
    -it \
    --rm \
    --security-opt seccomp=unconfined \
    --security-opt apparmor=unconfined \
    -e BUILDKITD_FLAGS=--oci-worker-no-process-sandbox \
    -v /path/to/dir:/tmp/work \
    --entrypoint buildctl-daemonless.sh \
    moby/buildkit:master-rootless \
        build \
        --frontend \
        dockerfile.v0 \
        --local context=/tmp/work \
        --local dockerfile=/tmp/work

Maintaned? #348

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