podman: Cannot do cross-platform builds from Dockerfiles with `RUN` commands

Is this a BUG REPORT or FEATURE REQUEST? (leave only one on its own line)

/kind bug

Description

I am using an arm-based Mac (M1 Ultra) to build an image for an Intel-based server. The Dockerfile has a RUN command in it. The build always fails when it reaches the RUN command.

Steps to reproduce the issue:

1. Have a Dockerfile with a RUN command in it.
2. From an M1-based Mac, build your image.

podman build --platform=linux/amd64 -t my_tag .

1. Note failure at RUN step

STEP 6/20: RUN npm install -g npm
exec container process `/bin/sh`: Exec format error
Error: error building at STEP "RUN npm install -g npm": error while running runtime: exit status 1

Describe the results you received:

The image failed to build with an Exec format error, the same error I would expect if I deployed an arm container on an amd64 machine.

Describe the results you expected:

I should be able to build an image on my M1 machine.

Additional information you deem important (e.g. issue happens only occasionally):

This happens consistently

Output of podman version:

Client:       Podman Engine
Version:      4.0.3
API Version:  4.0.3
Go Version:   go1.18
Built:        Fri Apr  1 10:28:59 2022
OS/Arch:      darwin/arm64

Server:       Podman Engine
Version:      4.0.2
API Version:  4.0.2
Go Version:   go1.16.14
Built:        Thu Mar  3 08:58:50 2022
OS/Arch:      linux/arm64

Output of podman info --debug:

host:
  arch: arm64
  buildahVersion: 1.24.1
  cgroupControllers:
  - memory
  - pids
  cgroupManager: systemd
  cgroupVersion: v2
  conmon:
    package: conmon-2.1.0-2.fc35.aarch64
    path: /usr/bin/conmon
    version: 'conmon version 2.1.0, commit: '
  cpus: 1
  distribution:
    distribution: fedora
    variant: coreos
    version: "35"
  eventLogger: journald
  hostname: localhost.localdomain
  idMappings:
    gidmap:
    - container_id: 0
      host_id: 1000
      size: 1
    - container_id: 1
      host_id: 100000
      size: 1000000
    uidmap:
    - container_id: 0
      host_id: 501
      size: 1
    - container_id: 1
      host_id: 100000
      size: 1000000
  kernel: 5.15.18-200.fc35.aarch64
  linkmode: dynamic
  logDriver: journald
  memFree: 1566859264
  memTotal: 2048237568
  networkBackend: netavark
  ociRuntime:
    name: crun
    package: crun-1.4.2-1.fc35.aarch64
    path: /usr/bin/crun
    version: |-
      crun version 1.4.2
      commit: f6fbc8f840df1a414f31a60953ae514fa497c748
      spec: 1.0.0
      +SYSTEMD +SELINUX +APPARMOR +CAP +SECCOMP +EBPF +CRIU +YAJL
  os: linux
  remoteSocket:
    exists: true
    path: /run/user/501/podman/podman.sock
  security:
    apparmorEnabled: false
    capabilities: CAP_CHOWN,CAP_DAC_OVERRIDE,CAP_FOWNER,CAP_FSETID,CAP_KILL,CAP_NET_BIND_SERVICE,CAP_SETFCAP,CAP_SETGID,CAP_SETPCAP,CAP_SETUID,CAP_SYS_CHROOT
    rootless: true
    seccompEnabled: true
    seccompProfilePath: /usr/share/containers/seccomp.json
    selinuxEnabled: true
  serviceIsRemote: true
  slirp4netns:
    executable: /usr/bin/slirp4netns
    package: slirp4netns-1.1.12-2.fc35.aarch64
    version: |-
      slirp4netns version 1.1.12
      commit: 7a104a101aa3278a2152351a082a6df71f57c9a3
      libslirp: 4.6.1
      SLIRP_CONFIG_VERSION_MAX: 3
      libseccomp: 2.5.3
  swapFree: 0
  swapTotal: 0
  uptime: 9m 23.19s
plugins:
  log:
  - k8s-file
  - none
  - passthrough
  - journald
  network:
  - bridge
  - macvlan
  volume:
  - local
registries:
  search:
  - docker.io
store:
  configFile: /var/home/core/.config/containers/storage.conf
  containerStore:
    number: 0
    paused: 0
    running: 0
    stopped: 0
  graphDriverName: overlay
  graphOptions: {}
  graphRoot: /var/home/core/.local/share/containers/storage
  graphStatus:
    Backing Filesystem: xfs
    Native Overlay Diff: "true"
    Supports d_type: "true"
    Using metacopy: "false"
  imageCopyTmpDir: /var/tmp
  imageStore:
    number: 6
  runRoot: /run/user/501/containers
  volumePath: /var/home/core/.local/share/containers/storage/volumes
version:
  APIVersion: 4.0.2
  Built: 1646319530
  BuiltTime: Thu Mar  3 08:58:50 2022
  GitCommit: ""
  GoVersion: go1.16.14
  OsArch: linux/arm64
  Version: 4.0.2

Package info (e.g. output of rpm -q podman or apt list podman):

n/a

Have you tested with the latest version of Podman and have you checked the Podman Troubleshooting Guide? (https://github.com/containers/podman/blob/main/troubleshooting.md)

No

Additional environment details (AWS, VirtualBox, physical, etc.):