Images are being build with no metadata

[mvanderlee]

Images build using dind with the latest image are missing entrypoint, author, workdir, environment variables and a host more metadata.

Snippet of docker inspect output:

"Parent": "", 
 "Comment": "buildkit.exporter.image.v0", 
 "Created": "2023-02-09T14:24:04.758910777Z", 
 "Container": "", 
 "ContainerConfig": { 
 "Hostname": "", 
 "Domainname": "", 
 "User": "", 
 "AttachStdin": false, 
 "AttachStdout": false, 
 "AttachStderr": false, 
 "Tty": false, 
 "OpenStdin": false, 
 "StdinOnce": false, 
 "Env": null, 
 "Cmd": null, 
 "Image": "", 
 "Volumes": null, 
 "WorkingDir": "", 
 "Entrypoint": null, 
 "OnBuild": null, 
 "Labels": null 
 }, 
 "DockerVersion": "", 
 "Author": "", 
 "Config": { 
 "Hostname": "", 
 "Domainname": "", 
 "User": "", 
 "AttachStdin": false, 
 "AttachStdout": false, 
 "AttachStderr": false, 
 "Tty": false, 
 "OpenStdin": false, 
 "StdinOnce": false, 
 "Env": [ 
 "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" 
 ], 
 "Cmd": null, 
 "Image": "", 
 "Volumes": null, 
 "WorkingDir": "/", 
 "Entrypoint": null, 
 "OnBuild": null, 
 "Labels": null 
 }, 
 "Architecture": "amd64", 
 "Os": "linux", 
 "Size": 394874390, 
 "VirtualSize": 394874390,

[tianon]

See https://github.com/moby/moby/releases/tag/v23.0.0, especially:

• Set Buildx and BuildKit as the default builder on Linux. [22.06 backport] api: set default "Builder-Version" to "2" (BuildKit) on Linux moby/moby#43992
  • Alias docker build to docker buildx build. Set buildx as default builder docker/cli#3314
  • The legacy builder can still be used by explicitly setting DOCKER_BUILDKIT=0.
  • There are differences in how BuildKit and the legacy builder handle multi-stage builds. For more information, see Multi-stage builds.