update dockerfile to remove `gem update --system` in steps #475

	name: Run Tests
	on:
	pull_request: # run tests for all PRs
	push: { branches: master } # only run tests on push / merges to master branch

	env:
	DATABASE_URL_TEST: postgresql://postgres:postgres@localhost/caesar_test

	jobs:
	tests:
	runs-on: ubuntu-latest
	services:
	postgres:
	image: postgres:11
	env:
	POSTGRES_PASSWORD: postgres
	ports:
	- 5432:5432
	options:
	--health-cmd pg_isready
	--health-interval 10ms
	--health-timeout 500ms
	--health-retries 15
	redis:
	image: redis
	ports:
	- 6379:6379
	options: --entrypoint redis-server

	steps:
	- name: Checkout code
	uses: actions/checkout@v2

	- name: Check for focus specs
	run: ./scripts/no_focus.sh

	- name: Setup Ruby and install gems
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: 2.7 # ensure we test the same ruby version we run under (see Dockerfile)
	bundler-cache: true

	- name: Setup test database
	run: RAILS_ENV=test bin/rails db:create

	- name: Run tests
	run: RAILS_ENV=test bundle exec rspec # avoid running spring via bin/rspec binstub

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