Neither modifing /etc/hosts nor adding '--add-host' flag worked for me

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• I've read the contributing guidelines and wholeheartedly agree

I've found a bug and checked that ...

• ... the documentation does not mention anything about my problem
• ... there are no open or closed issues that are related to my problem

Description

I modified the /etc/hosts file on my machine and changed the IP address of registry.my.example.com from 10.20.247.48 to 10.106.174.220, then I run "docker buildx build" command with '--add-host registry.my.example.com:10.106.174.220', but the modification seems not working.

Expected behaviour

the /etc/hosts file in the builder container should be like this:

10.106.174.220 registry.my.example.com

Actual behaviour

This is the output of sudo docker exec -t buildx_buildkit_zstd-builder0 cat /etc/hosts:

10.20.247.48 registry.my.example.com

Buildx version

github.com/docker/buildx v0.5.0-docker 780fad46f23e8d7c2d741d59144617aae5285b22

Docker info

No response

Builders list

NAME/NODE       DRIVER/ENDPOINT             STATUS   PLATFORMS
zstd-builder *  docker-container
  zstd-builder0 unix:///var/run/docker.sock running linux/amd64, linux/amd64/v2, linux/amd64/v3, 
                                                    linux/amd64/v4, linux/386
default         docker
  default       default                     running  linux/amd64, linux/386

Configuration

docker buildx create command:

sudo docker buildx create \
        --name zstd-builder \
        --driver docker-container \
        --driver-opt image=moby/buildkit:v0.10.3,network=host \
        --buildkitd-flags '--allow-insecure-entitlement security.insecure --allow-insecure-entitlement network.host' \
        --use

docker buildx build command:

sudo docker buildx build --pull -t <some_image_name_with_tag> --add-host registry.my.example.com:10.106.174.220 \
            --file Dockerfile \
            --output type=image,name="registry.my.example.com/<some_image_name_with_tag>",oci-mediatypes=true,compression=zstd,compression-level=3,force-compression=true,push=true .

Build logs

No response

Additional info

No response

Start by reproducing the docker-container builder setup with the reported docker buildx create and buildx build commands, then inspect how the --add-host value is handled for that driver. Compare the builder container's /etc/hosts entry with the requested mapping and verify the behavior against the expected 10.106.174.220 address.