Docker compose build does not honor the custom port for the git repository

[DominicDetta]

Description

I'm trying to build an image using the following syntax of docker-compose:

    slim: 
        build: 
            context: git@host:2020/myrepo.git#0.0.1.dev
            ssh:
                - default

My ssh keys are already recognized by the ssh agent when I look up with the command ssh-add -l.

The error that occurs (I replaced the real repository url for condidentiality):

failed to solve: failed to read dockerfile: failed to load cache key: failed to fetch remote git@host:2020/xxxxxxxx.git: git stderr:
ssh: connect to host xxxxxxxxx port 22: Connection refused
fatal: Could not read from remote repository.

As you can see while building it's trying to connect with 22 port instead of 2020. Is there a way to configure the ssh port which will use?

Reproduce

Any git repository with a custom port

slim: 
        build: 
            context: git@host:2020/myrepo.git#0.0.1.dev
            ssh:
                - default

Expected behavior

No response

docker version

Server: Docker Desktop 4.32.0 (157355)
 Engine:
  Version:          27.0.3
  API version:      1.46 (minimum version 1.24)
  Go version:       go1.21.11
  Git commit:       662f78c
  Built:            Sat Jun 29 00:02:44 2024
  OS/Arch:          linux/arm64
  Experimental:     false
 containerd:
  Version:          1.7.18
  GitCommit:        ae71819c4f5e67bb4d5ae76a6b735f29cc25774e
 runc:
  Version:          1.7.18
  GitCommit:        v1.1.13-0-g58aa920
 docker-init:
  Version:          0.19.0
  GitCommit:        de40ad0

docker info

Client:
 Version:    27.0.3
 Context:    desktop-linux
 Debug Mode: false
 Plugins:
  buildx: Docker Buildx (Docker Inc.)
    Version:  v0.15.1-desktop.1
    Path:     /Users/dominic/.docker/cli-plugins/docker-buildx
  compose: Docker Compose (Docker Inc.)
    Version:  v2.28.1-desktop.1
    Path:     /Users/dominic/.docker/cli-plugins/docker-compose
  debug: Get a shell into any image or container (Docker Inc.)
    Version:  0.0.32
    Path:     /Users/dominic/.docker/cli-plugins/docker-debug
  desktop: Docker Desktop commands (Alpha) (Docker Inc.)
    Version:  v0.0.14
    Path:     /Users/dominic/.docker/cli-plugins/docker-desktop
  dev: Docker Dev Environments (Docker Inc.)
    Version:  v0.1.2
    Path:     /Users/dominic/.docker/cli-plugins/docker-dev
  extension: Manages Docker extensions (Docker Inc.)
    Version:  v0.2.25
    Path:     /Users/dominic/.docker/cli-plugins/docker-extension
  feedback: Provide feedback, right in your terminal! (Docker Inc.)
    Version:  v1.0.5
    Path:     /Users/dominic/.docker/cli-plugins/docker-feedback
  init: Creates Docker-related starter files for your project (Docker Inc.)
    Version:  v1.3.0
    Path:     /Users/dominic/.docker/cli-plugins/docker-init
  sbom: View the packaged-based Software Bill Of Materials (SBOM) for an image (Anchore Inc.)
    Version:  0.6.0
    Path:     /Users/dominic/.docker/cli-plugins/docker-sbom
  scout: Docker Scout (Docker Inc.)
    Version:  v1.10.0
    Path:     /Users/dominic/.docker/cli-plugins/docker-scout

Server:
 Containers: 28
  Running: 14
  Paused: 0
  Stopped: 14
 Images: 316
 Server Version: 27.0.3
 Storage Driver: overlay2
  Backing Filesystem: extfs
  Supports d_type: true
  Using metacopy: false
  Native Overlay Diff: true
  userxattr: false
 Logging Driver: json-file
 Cgroup Driver: cgroupfs
 Cgroup Version: 2
 Plugins:
  Volume: local
  Network: bridge host ipvlan macvlan null overlay
  Log: awslogs fluentd gcplogs gelf journald json-file local splunk syslog
 Swarm: inactive
 Runtimes: io.containerd.runc.v2 runc
 Default Runtime: runc
 Init Binary: docker-init
 containerd version: ae71819c4f5e67bb4d5ae76a6b735f29cc25774e
 runc version: v1.1.13-0-g58aa920
 init version: de40ad0
 Security Options:
  seccomp
   Profile: unconfined
  cgroupns
 Kernel Version: 6.6.32-linuxkit
 Operating System: Docker Desktop
 OSType: linux
 Architecture: aarch64
 CPUs: 10
 Total Memory: 11.67GiB
 Name: docker-desktop
 ID: d8bc883c-c35e-43ba-a854-e1bc9cad0abc
 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
 Labels:
  com.docker.desktop.address=unix:///Users/dominic/Library/Containers/com.docker.docker/Data/docker-cli.sock
 Experimental: false
 Insecure Registries:
  hubproxy.docker.internal:5555
  127.0.0.0/8
 Live Restore Enabled: false

WARNING: daemon is not using the default seccomp profile

Diagnostics ID

D4FECCAA-5C1F-4978-BA23-A2DC789DDB71/20250217163125

Additional Info

No response