Compose V2 does not output multiline environment variable error correctly

[MartinsSmirnovs]

Description

For given docker-compose.yml, if we have not set WHOAMI environment variable, Compose V2 will not output multiline error as Compose V1 does.

x-whoami: &whoami |-
    ${WHOAMI?
    Hint:
    Set WHOAMI environment variable
    }


services:
  foo:
    image: alpine
    environment:
        WHOAMI: *whoami

Steps to reproduce the issue:

1. Create docker-compose.yml with given contents.
2. Observe different docker-compose up outputs for Compose V1 and V2.

Results for Compose V1

$ docker-compose up
ERROR: Missing mandatory value for "environment" option interpolating {'WHOAMI': '${WHOAMI?\nHint:\nSet WHOAMI environment variable\n}'} in service "foo":
Hint:
Set WHOAMI environment variable

$

Results for Compose V2

$ docker-compose up
invalid interpolation format for x-whoami: "required variable WHOAMI is missing a value: \nHint:\nSet WHOAMI environment variable\n". You may need to escape any $ with another $
$

Expected results:
Compose V2 should output multiline error string as Compose V1 does.

Output of docker-compose --version:
Compose --version output with executable changing in between:

$ docker-compose --version
docker-compose version 1.29.2, build 5becea4c
$ docker-compose --version
Docker Compose version v2.6.0
$

Output of docker info:

$ docker info
Client:
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc., v0.8.2)
  compose: Docker Compose (Docker Inc., v2.6.0)
  sbom: View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc., 0.6.0)
  scan: Docker Scan (Docker Inc., v0.17.0)

Server:
 Containers: 2
  Running: 1
  Paused: 0
  Stopped: 1
 Images: 19
 Server Version: 20.10.16
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 1
 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.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 212e8b6fa2f44b9c21b2798135fc6fb7c53efc16
 runc version: v1.1.1-0-g52de29d
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
 Kernel Version: 5.10.16.3-microsoft-standard-WSL2
 Operating System: Docker Desktop
 OSType: linux
 Architecture: x86_64
 CPUs: 4
 Total Memory: 9.728GiB
 Name: docker-desktop
 ID: LIV4:465T:SSGL:P2Q6:7Y6O:UIQR:3TXQ:UJAR:H43B:KH7B:7SKQ:5LIF
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 HTTP Proxy: http.docker.internal:3128
 HTTPS Proxy: http.docker.internal:3128
 No Proxy: hubproxy.docker.internal
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  hubproxy.docker.internal:5000
  127.0.0.0/8
 Live Restore Enabled: false

WARNING: No blkio throttle.read_bps_device support
WARNING: No blkio throttle.write_bps_device support
WARNING: No blkio throttle.read_iops_device support
WARNING: No blkio throttle.write_iops_device support
$

[ulyssessouza]

Closed by compose-spec/compose-go#292