buildkit-script.sh

#!/bin/sh

buildsh=$(mktemp /tmp/buildsh.XXXXXX)

cat <<-EOF > $buildsh
buildctl-daemonless.sh build \
--frontend=dockerfile.v0 \
--local context=. \
--local dockerfile=. \
--output type=oci,name=example:latest,dest=output.tar
EOF

cat $buildsh | \
        docker run -i --rm --entrypoint sh \
        -v $(pwd):/workdir --workdir /workdir \
        --security-opt seccomp=unconfined \
        --env BUILDKITD_FLAGS="--oci-worker-no-process-sandbox" \
        moby/buildkit:rootless -s
rm $buildsh