[CSTONEG-62]: add GitHub Actions release workflow for gem publishing

[mattl3w1s]

CSTONEG-62

Add a GitHub Actions workflow that publishes the procore-sift gem to RubyGems when lib/sift/version.rb changes on main. Also supports manual dispatch for ad-hoc releases.

The workflow has two jobs:

1. version-check — detects whether lib/sift/version.rb was modified in the push
2. release — builds and pushes the gem, gated on version-check (or workflow_dispatch)

Uses fac/ruby-gem-setup-credentials-action and fac/ruby-gem-push-action for credential management and publishing. Requires a RUBY_GEMS_API_KEY secret to be configured on the repo.

Testing Notes

• Verify RUBY_GEMS_API_KEY secret is configured on the repo
• Trigger a manual workflow_dispatch run to confirm the workflow executes successfully
• Bump version in lib/sift/version.rb, merge to main, and confirm gem is published

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