…lows (#10)

…#12)

* refactor(script): extract parser function in its own file for testing

* test(yaml-parser): add foundations for testing yaml-parser

* test(yaml-parser): add examples where the parser should modify the file

* test(yaml-parser): add example where the parser should not modify the file

…s cache (#14)

* feat(yaml-parser): replace bahmutov/npm-install for npm ci if uses cache

* test(yaml-parser): add coverage for bahmutov/npm-install use case

* test(yaml-parser): add coverage for actions/cache remove step