fix: stop tracking Policyfile.lock.json

[ramereth]

Problem

Policyfile.lock.json is tracked and pins nodejs to an exact version (11.0.0), while release-please only bumps metadata.rb (currently 11.0.1). Whenever the two disagree, ChefSpec's policyfile install aborts the entire RSpec suite before a single example runs:

CookbookOmnifetch::CookbookValidationFailure:
  The cookbook downloaded for Cookbook 'nodejs' = 11.0.0 {:path=>"."}
  did not satisfy the constraint.

Fix

Untrack the lock. It is a generated artifact — chefignore already excludes it from the published cookbook, and 171 of 179 sous-chefs repos do not track it.

Bumping the version inside the lock is not a viable alternative: it also carries identifier and dotted_decimal_identifier fields derived from cookbook content.

Same fix as sous-chefs/logrotate#226.

[github-actions]

Slowest examples

Top 10 slowest examples (1.05 seconds, 39.09% of total time)

Example	Description	Time in seconds
spec/unit/library/helper_spec.rb:18	helper methods npm_dist should return a url based on the version	0.29788
spec/unit/resources/nodejs_repository_spec.rb:16	nodejs_repository on ubuntu is expected to create directory "/etc/apt/keyrings"	0.14284
spec/unit/resources/nodejs_install_spec.rb:16	nodejs_install package install on ubuntu is expected to install package "nodejs"	0.12711
spec/unit/resources/nodejs_install_spec.rb:15	nodejs_install package install on ubuntu is expected to create nodejs_repository "nodesource"	0.09518
spec/unit/resources/npm_package_spec.rb:25	npm_package install a versioned package is expected to run execute "install NPM package async"	0.06699
spec/unit/resources/nodejs_install_spec.rb:33	nodejs_install package install on rocky linux is expected to disable dnf_module "nodejs"	0.06662
spec/unit/resources/nodejs_install_spec.rb:88	nodejs_install source install is expected to install package "python3"	0.06523
spec/unit/resources/nodejs_install_spec.rb:113	nodejs_install source install on rocky linux is expected to run execute "install python3 build package"	0.06498
spec/unit/resources/nodejs_repository_spec.rb:18	nodejs_repository on ubuntu is expected to add apt_preference "nodesource"	0.06471
spec/unit/resources/nodejs_repository_spec.rb:17	nodejs_repository on ubuntu is expected to create remote_file "/etc/apt/keyrings/nodesource.asc"	0.06466

[ramereth]

Closing in favor of #319