[BUG] docker compose publish ignores `required: false` on `env_file`

[karnarokEpoch]

Description

env_file with required: false is honoured at runtime (up, run, etc.)
but docker compose publish scans every env_file entry unconditionally,
failing if the file is absent:

env_file:
 - path: ./.env
 required: false

failed to scan env file ./.env: open ./.env: no such file or directory

Steps To Reproduce

1. Create the file:

cat > compose.yaml <<EOF
services:
 whoami:
 image: docker.io/traefik/whoami:v1.11
 env_file:
 - path: ./.env
 required: false
EOF

2. Publish (no .env present):

docker compose publish <registry>/<image>:<tag>

Compose Version

$ docker-compose version
Command 'docker-compose' not found, but can be installed with:
sudo snap install docker # version 28.4.0, or
sudo apt install docker-compose # version 1.29.2-6
See 'snap info docker' for additional versions.

$ docker compose version
Docker Compose version v5.1.0

Docker Environment

$ docker info
Client: Docker Engine - Community
 Version: 29.3.0
 Context: default
 Debug Mode: false
 Plugins:
 buildx: Docker Buildx (Docker Inc.)
 Version: v0.31.1
 Path: /usr/libexec/docker/cli-plugins/docker-buildx
 compose: Docker Compose (Docker Inc.)
 Version: v5.1.0
 Path: /usr/libexec/docker/cli-plugins/docker-compose

Server:
 Containers: 0
 Running: 0
 Paused: 0
 Stopped: 0
 Images: 119
 Server Version: 4.9.3
 Storage Driver: overlay
 Supports d_type: true
 Native Overlay Diff: true
 Using metacopy: false
 Supports shifting: false
 Supports volatile: true
 Backing Filesystem: extfs
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
 Volume: local
 Network: bridge macvlan ipvlan
 Log: k8s-file none passthrough journald
 Swarm: inactive
 Runtimes: crun ocijail runsc crun-wasm kata krun runc runj youki
 Default Runtime: crun
 Init Binary: 
 containerd version: 
 runc version: 
 init version: 
 Security Options:
 seccomp
 Profile: default
 rootless
 Kernel Version: 6.6.87.2-microsoft-standard-WSL2
 Operating System: ubuntu
 OSType: linux
 Architecture: amd64
 CPUs: 8
 Total Memory: 7.557GiB
 Name: DENEC1
 ID: 22893162-076d-4bf1-b265-666029302de0
 Docker Root Dir: /home/karna/.local/share/containers/storage
 Debug Mode: false
 Experimental: true
 Live Restore Enabled: false
 Product License: Apache-2.0

Anything else?

I'm using podman with docker-compose-plugin. Docker Engine is not installed.
Docker CLI use podman thanks to export DOCKER_HOST="unix://${XDG_RUNTIME_DIR}podman/podman.sock"
I don't think it change anything but for transparency.

I have used an AWS ECS for my test.