Parameter expansion resolves invalid default value

[remi00]

Description

There is a problem resolving the environment variables when using env_file parameter. The resolution works great with environment parameter. Shell resolution on the host also works just fine. Feature works in docker compose v1.x.

I guess this relates with compose-go support, but from end-user point of view, docker compose official docs state that this feature should basically work.

Steps to reproduce the issue:

1. Setup basic configuration like this:

# docker-compose.yml:
version: "3.9"
services:
  foobar:
    image: any.foo/bar
    env_file: ./some.env
    entrypoint: /usr/bin/foo/bar
    environment:
      - FROM_YAML=${FROM_YAML:-it-works-great}

and:

# some.env:
FROMENVFILE=${FROMENVFILE:-it-does-not-work-well}

2. Run docker compose config

Describe the results you received:

name: foobar
services:
  foobar:
    entrypoint:
    - /usr/bin/foo/bar
    environment:
      FROM_YAML: it-works-great
      FROMENVFILE: :-it-does-not-work-well}
    image: any.foo/bar
    networks:
      default: null
networks:
  default:
    name: foobar_default

Describe the results you expected:

name: foobar
services:
  foobar:
    entrypoint:
    - /usr/bin/foo/bar
    environment:
      FROM_YAML: it-works-great
      FROMENVFILE: : it-does-not-work-well
    image: any.foo/bar
    networks:
      default: null
networks:
  default:
    name: foobar_default

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

Output of docker compose version:

Docker Compose version v2.3.3
(also v2.4.1)

Output of docker info:

Client:
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc., v0.7.1-docker)
  compose: Docker Compose (Docker Inc., 2.3.3)

Server:
 Containers: 9
  Running: 1
  Paused: 0
  Stopped: 8
 Images: 6
 Server Version: 20.10.12
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: false
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: systemd
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local logentries splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runtime.v1.linux runc io.containerd.runc.v2
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 10f428dac7cec44c864e1b830a4623af27a9fc70.m
 runc version: v1.1.0-0-g067aaf85
 init version: de40ad0
 Security Options:
  apparmor
  seccomp
   Profile: default
  cgroupns
 Kernel Version: 5.10.105-1-MANJARO
 Operating System: Manjaro Linux
 OSType: linux
 Architecture: x86_64
 CPUs: 24
 Total Memory: 62.81GiB
 Name: <redacted>
 ID: <redacted>
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Username: remi00
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

[remi00]

Duplicate of #9303