Cannot select platform for build

[vdo]

Description of the issue

I can build a container selecting the platform (with experimental features enabled) with the command:
docker build --platform arm64 --pull -t <tag> .
This will run a cross compile build on the selected platform and I can build such Dockerfile for amd64, arm and arm64

When using docker-compose however, looks like the platform arg is not passed to the build, so it keeps using the underlying OS arch.

Running docker-compose with --no-cache or --pull does not help.

Note: all upstream packages have multi-arch enabled

Context information (for bug reports)

Output of docker-compose version

docker-compose version 1.25.5, build unknown
docker-py version: 4.2.0
CPython version: 3.8.2
OpenSSL version: OpenSSL 1.1.1g  21 Apr 2020

Output of docker version

Client:
 Version:           19.03.8-ce
 API version:       1.40
 Go version:        go1.14.1
 Git commit:        afacb8b7f0
 Built:             Thu Apr  2 00:04:36 2020
 OS/Arch:           linux/amd64
 Experimental:      false

Server:
 Engine:
  Version:          19.03.8-ce
  API version:      1.40 (minimum version 1.12)
  Go version:       go1.14.1
  Git commit:       afacb8b7f0
  Built:            Thu Apr  2 00:04:16 2020
  OS/Arch:          linux/amd64
  Experimental:     true
 containerd:
  Version:          v1.3.4.m
  GitCommit:        d76c121f76a5fc8a462dc64594aea72fe18e1178.m
 runc:
  Version:          1.0.0-rc10
  GitCommit:        dc9208a3303feef5b3839f4323d9beb36df0a9dd
 docker-init:
  Version:          0.18.0
  GitCommit:        fec3683

Output of docker-compose config
(Make sure to add the relevant -f and other flags)

version: "3.4"
networks:
  network:
    driver: bridge
    ipam:
      config:
        - subnet: 172.33.0.0/16
volumes:
  vpndnpdappnodeeth_shared: {}
services:
  admin.dnp.dappnode.eth:
    build:
      context: .
      dockerfile: ./build/Dockerfile
      args:
        platform: arm64
    image: "admin.dnp.dappnode.eth:0.2.19"
    container_name: DAppNodeCore-admin.dnp.dappnode.eth
    restart: always
    dns: 172.33.1.2
    ports:
      - "8090:8090"
    volumes:
      - "vpndnpdappnodeeth_shared:/usr/www/openvpn/cred"
    networks:
      network:
        ipv4_address: 172.33.1.9
    logging:
      driver: journald

Steps to reproduce the issue

1. Install required qemu packages
2. docker run --rm --privileged docker/binfmt:a7996909642ee92942dcd6cff44b9b95f08dad64
3. Enable experimental features in docker daemon
4. Run the commands above

Observed result

Builds with amd64 platform

Expected result

Builds with arm64 platform

Additional information

Linux spectre 5.6.10-3-MANJARO #1 SMP PREEMPT Sun May 3 11:03:28 UTC 2020 x86_64 GNU/Linux

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This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically closed because it had not recent activity during the stale period.