Docker compose overwrite env_file PATH with host PATH

[rrcrrcrrc]

Description

docker-compose on windows with docker-desktop with WSL2 (ubuntu) overwrite PATH declared on .env file
Steps to reproduce the issue:

1. Create myenv.env file and set PATH="/some/customs/paths:/other/custom/path"
2. Create docker-compose.yaml and service with "env_file"
3. Run docker-compose up

Describe the results you received:

/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/usr/lib/wsl/lib:/mnt/c/ProgramData/Oracle/Java/javapath:/mnt/c/WINDOWS/system32:/mnt/c/WINDOWS:/mnt/c/WINDOWS/System32/Wbem:/mnt/c/WINDOWS/System32/WindowsPowerShell/v1.0/:/mnt/c/WINDOWS/System32/OpenSSH/:/mnt/c/Program Files/SourceGear/Common/DiffMerge/:/mnt/c/Program Files/Java/jdk1.8.252_09/bin:/mnt/c/ProgramData/chocolatey/bin:/mnt/c/Program Files/Docker/Docker/resources/bin:/mnt/c/ProgramData/DockerDesktop/version-bin:/mnt/c/Users/myusername/AppData/Local/Microsoft/WindowsApps:/mnt/c/Users/myusername/AppData/Local/Programs/Microsoft VS Code/bin:/mnt/c/Users/myusername/AppData/Local/Programs/Git/cmd:/snap/bin

Describe the results you expected:
The variable PATH must be "/some/customs/paths:/other/custom/path" defined on myenv.env

Additional information you deem important (e.g. issue happens only occasionally):
It happens when I update docker-compose to v2.6.0 (I update docker desktop, and docker desktop use that version)

Output of docker compose version:

Docker Compose version v2.6.0

Output of docker info:

Ricardo, [08/06/2022 14:57]
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)
WARNING: Plugin "/usr/libexec/docker/cli-plugins/docker-app" is not valid: failed to fetch metadata: fork/exec /usr/libexec/docker/cli-plugins/docker-app: no such file or directory

Server:
 Containers: 5
  Running: 4
  Paused: 0
  Stopped: 1
 Images: 8
 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: 8
 Total Memory: 5.801GiB
 Name: docker-desktop
 ID: PY4U:RZHA:R6OD:2NUV:5LYZ:SA47:DVJQ:4DPG:5GFG:BZYU:55JF:GVP2
 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

[Tbaile]

Can confirm the same issue running in Linux, every .env file value gets overridden by the local user ENV.

Client:
 Context:    default
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc., v0.8.2-docker)
  compose: Docker Compose (Docker Inc., 2.6.0)

Server:
 Containers: 11
  Running: 0
  Paused: 0
  Stopped: 11
 Images: 29
 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: 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.runc.v2 io.containerd.runtime.v1.linux runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: 96df0994faabc1944fc614e52b0b3c6feb609a57.m
 runc version:
 init version: de40ad0
 Security Options:
  seccomp
   Profile: default
  cgroupns
 Kernel Version: 5.18.2-arch1-1
 Operating System: Arch Linux
 OSType: linux
 Architecture: x86_64
 CPUs: 12
 Total Memory: 15.25GiB
 Name: XPS-di-Tommaso
 ID: LE34:5R5K:L5I3:H6TT:XAQJ:EPH3:SZB5:MBCX:7VPD:SRG5:K6DL:ZSF3
 Docker Root Dir: /var/lib/docker
 Debug Mode: false
 Registry: https://index.docker.io/v1/
 Labels:
 Experimental: false
 Insecure Registries:
  127.0.0.0/8
 Live Restore Enabled: false

[glours]

duplicate #9521