Cache gems to s3

cache_bundle_workflow_s3.yaml

env:
  AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
  AWS_DEFAULT_REGION: us-east-1
  AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }} 
 
jobs:
  rspec:
    runs-on: ubuntu-16.04
    steps:
      - name: Restore bundle cache
        run: >
          aws s3 ls s3://mybucket/build-cache/gems-${{ hashFiles('Gemfile.lock') }}.tar.gz &&
          aws s3 cp s3://mybucket/build-cache/gems-${{ hashFiles('Gemfile.lock') }}.tar.gz bundle_cache.tar.gz --only-show-errors &&
          tar -xf bundle_cache.tar.gz ||
          true

      - name: Bundle install
        run: bundle install --deployment --jobs 4 --full-index

      - name: Cache bundle
        run: >
          aws s3 ls s3://mybucket/build-cache/gems-${{ hashFiles('Gemfile.lock') }}.tar.gz ||
          (tar -acf gems-${{ hashFiles('Gemfile.lock') }}.tar.gz vendor/bundle &&
          aws s3 cp gems-${{ hashFiles('Gemfile.lock') }}.tar.gz s3://mybucket/build-cache/ --only-show-errors)