Cache ruby gems to speed up installation

[reviewdog]

Cache ruby gems to speed up installation

[nyancat3]

@kleinjm How about using skip_install and use_bundler options with bundler-cache: true of setup-ruby?

name: reviewdog
on: [pull_request]
permissions:
  contents: read
  pull-requests: write
jobs:
  rubocop:
    name: runner / rubocop
    runs-on: ubuntu-latest
    steps:
      - name: Check out code
        uses: actions/checkout@v3
      - uses: ruby/setup-ruby@v1
        with:
          bundler-cache: true # runs 'bundle install' and caches installed gems automatically
      - name: rubocop
        uses: reviewdog/action-rubocop@v2
        with:
          rubocop_version: gemfile
          rubocop_extensions: rubocop-rails:gemfile rubocop-rspec:gemfile
          reporter: github-pr-review # Default is github-pr-check
          skip_install: true
          use_bundler: true