Add heroku skill for local CLI deployment

[baonguyenNava]

No description provided.

[github-actions]

Skill quality check

1 skills evaluated — 1 passed, 0 warning, 0 critical.

skills/heroku-rails-deploy/SKILL.md — PASS

Dimension	Verdict	Summary
Triggerability	pass	The description identifies a specific domain (Heroku, Strata Rails) and a clear trigger action (deploying). It is distinct from sibling skills which focus on scaffolding, models, and views.
Instructional clarity	pass	The body provides a comprehensive step-by-step guide with over 20 lines of substantive content, including concrete bash, Ruby, and YAML snippets. It explains the 'why' behind complex steps like buildpack ordering and eager-loading crashes.
Self-containedness	pass	The skill references standard Rails project paths and Heroku CLI commands appropriate for a deployment guide. It does not rely on missing internal repo resources or broken references.
Anti-patterns	pass	The description is in the third person and adheres to length constraints. The body avoids filler phrases like 'just' or 'simply' and follows the authoring standards.