gh-229 Port CI from obsolete travis-CI to GitHub actions

Author: geekq

.github/workflows/test.yml

@@ -0,0 +1,28 @@
+name: Test
+on:
+  push:
+    branches:
+      - develop
+      - 1-2-stable
+  pull_request:
+jobs:
+  test:
+    name: Test
+    runs-on: ubuntu-latest
+    timeout-minutes: 15
+    strategy:
+      matrix:
+        ruby: [2.4, 2.7, 3.0]
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true # Also installs gems
+      - name: Install prerequisites for tests
+        run: sudo apt-get install -y graphviz
+      - name: Run tests
+        run: bundle exec rake test
+

.travis.yml

@@ -6,8 +6,8 @@
 
 # Workflow
 
-image:https://badge.fury.io/rb/workflow.svg[link=https://badge.fury.io/rb/workflow]
-image:https://travis-ci.org/geekq/workflow.svg[link=https://travis-ci.org/geekq/workflow]
+image:https://img.shields.io/gem/v/workflow.svg[link=https://rubygems.org/gems/workflow]
+image:https://github.com/geekq/workflow/actions/workflows/test.yml/badge.svg[link=https://github.com/geekq/workflow/actions/workflows/test.yml]
 image:https://codeclimate.com/github/geekq/workflow/badges/gpa.svg[link=https://codeclimate.com/github/geekq/workflow]
 image:https://codeclimate.com/github/geekq/workflow/badges/coverage.svg[link=https://codeclimate.com/github/geekq/workflow/coverage]