Follow logs on primary role by default

[jeromedalbert]

Problem

kamal app logs -f doesn't work if the primary role is not "web".

Steps to repro:

• have primary_role: worker in config/deploy.yml
• run kamal app logs -f

Actual behavior:

  INFO Following logs on [REDACTED_IP]...
  ERROR (ArgumentError): No --roles match for web

Expected behavior: kamal app logs -f should follow logs on the primary role; in this case "worker".

Solution

Do not default kamal app logs -f to use the hardcoded "web" role; instead use the primary role, which can be different from "web".