fix(publish): accept short-form port mappings (fixes #13672)

[Ijtihed]

What I did

docker compose publish failed with 'services[whoami].ports[0]' expected a map or struct, got "string" when a service used short-form port syntax like ${DASHBOARD_PORT:-3000}:3000.

composeFileAsByteReader used LoadWithContext which decodes ports into typed Go structs which rejects short-form string entries. Switching to LoadModelWithContext returns a raw map instead which in ths case avoids the struct decode

Related issue

Fixes #13672

[Mohataseem89]

i have one question regarding coverage:
does this approach also handle other valid short-form port declarations beyond the reproducer, for example:

ports:
  - "8080:80"
  - "127.0.0.1:8080:80"
  - "${PORT:-8080}:80"

It may be worth adding or extending tests to cover a few representative short-form variants to ensure the publish path remains aligned with Compose port syntax support

[Ijtihed]

i have one question regarding coverage: does this approach also handle other valid short-form port declarations beyond the reproducer, for example:

ports:
  - "8080:80"
  - "127.0.0.1:8080:80"
  - "${PORT:-8080}:80"

It may be worth adding or extending tests to cover a few representative short-form variants to ensure the publish path remains aligned with Compose port syntax support

Agree, done

[Ijtihed]

ping :) @glours @ndeloof