Implement Index#workdir_path_modified? #53

	name: Ruby Build
	on: [push, pull_request]
	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	ruby: [2.6.0, 2.7.6, 3.0.0]
	steps:
	- run: echo "The job was automatically triggered by a ${{ github.event_name }} event."
	- run: echo "This job is now running on a ${{ runner.os }} server hosted by GitHub!"
	- run: echo "The name of your branch is ${{ github.ref }} and your repository is ${{ github.repository }}."
	- name: Check out repository code
	uses: actions/checkout@v2
	- run: echo "The ${{ github.repository }} repository has been cloned to the runner."
	- run: echo "The workflow is now ready to test your code on the runner."
	- name: List files in the repository
	run: \|
	ls ${{ github.workspace }}
	- uses: ruby/setup-ruby@v1
	with:
	ruby-version: ${{ matrix.ruby }}
	bundler-cache: true
	- name: exec rake
	run: bundle exec rake

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