Enable Ruby testing github workflow (#1994)

* Enable Ruby testing github workflow

* change `ruby-version` => `ruby` in matrix

* disable fail-fast

* Use lastest of each minor version

* add code climate reporting

the Travis builds reported results back to code climate, and this restores that.

@stympy We should move the the CC Reporter Id to the [repo's secrets](https://help.github.com/en/actions/configuring-and-managing-workflows/creating-and-storing-encrypted-secrets) and regenerate it (for safety). I'm unable to do that as accessing the repo's secrets requires `admin` permissions.

* Use the GitHub action badge in the README

* link directly to tests

.github/workflows/ruby.yml

@@ -0,0 +1,55 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support
+# documentation.
+# This workflow will download a prebuilt Ruby version, install dependencies and run tests with Rake
+# For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby
+
+name: Tests
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  test: 
+    name: Ruby ${{ matrix.ruby }}
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false # don't fail all matrix builds if one fails
+      matrix:
+        ruby:
+          - '2.3' 
+          - '2.4' 
+          - '2.5' 
+          - '2.6' 
+          - '2.7'
+          - 'head'
+    continue-on-error: ${{ endsWith(matrix.ruby, 'head') }}
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+
+    - name: Install dependencies
+      run: bundle install
+
+    - name: Setup Code Climate test-reporter
+      run: |
+        curl -L https://codeclimate.com/downloads/test-reporter/test-reporter-latest-linux-amd64 > ./cc-test-reporter
+        chmod +x ./cc-test-reporter
+        ./cc-test-reporter before-build
+    
+    - name: Run tests
+      run: bundle exec rake
+
+    - name: Publish code coverage
+      env:
+        CC_TEST_REPORTER_ID: c9b8356df2031a5a72462555fe898245cf24d83c7bb82c40ddb5c6c6976c4319
+        # CC_TEST_REPORTER_ID:  ${{ secrets.CodeClimateReporterId }}
+      run: |
+        export GIT_BRANCH="${GITHUB_REF/refs\/heads\//}"
+        ./cc-test-reporter after-build -r $CC_TEST_REPORTER_ID

README.md

@@ -2,7 +2,7 @@
 ![logotype a happy-07](https://user-images.githubusercontent.com/36028424/40263395-4318481e-5b44-11e8-92e5-3dcc1ce169b3.png)
 
 # Faker
-[![Build Status](https://travis-ci.org/faker-ruby/faker.svg?branch=master)](https://travis-ci.org/faker-ruby/faker)
+[![Tests](https://github.com/faker-ruby/faker/workflows/Tests/badge.svg)](https://github.com/faker-ruby/faker/actions?query=workflow%3ATests)
 [![Gem Version](https://badge.fury.io/rb/faker.svg)](https://badge.fury.io/rb/faker)
 [![Inline docs](https://inch-ci.org/github/faker-ruby/faker.svg?branch=master)](https://inch-ci.org/github/faker-ruby/faker)
 [![Test Coverage](https://api.codeclimate.com/v1/badges/ef54c7f9df86e965d64b/test_coverage)](https://codeclimate.com/github/stympy/faker/test_coverage)