Switch to GitHub Actions CI.

.github/workflows/ci.yml

@@ -0,0 +1,69 @@
+name: CI
+
+on: [push, pull_request]
+
+env:
+  CI: true
+  NODE: 12.x
+  RUBY: 2.6.x
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, windows-latest]
+
+    steps:
+      - name: Clone repository
+        uses: actions/checkout@v2
+
+      - name: Set Node.js version
+        uses: actions/setup-node@v1
+        with:
+          node-version: ${{ env.NODE }}
+
+      - name: Set up Ruby
+        uses: actions/setup-ruby@v1
+        with:
+          ruby-version: ${{ env.RUBY }}
+
+      - name: Disable gem docs
+        run: 'echo "gem: --no-document" > ~/.gemrc'
+
+      - name: Set up Ruby cache
+        uses: actions/cache@v1
+        with:
+          path: vendor/bundle
+          key: ${{ runner.os }}-ruby-v${{ env.RUBY }}-${{ hashFiles('Gemfile') }}-${{ hashFiles('Gemfile.lock') }}-${{ hashFiles('.github/workflows/ci.yml') }}
+          restore-keys: |
+            ${{ runner.os }}-ruby-v${{ env.RUBY }}-${{ hashFiles('Gemfile') }}-${{ hashFiles('Gemfile.lock') }}-${{ hashFiles('.github/workflows/ci.yml') }}
+
+      - name: Set up npm cache
+        uses: actions/cache@v1
+        with:
+          path: ~/.npm
+          key: ${{ runner.os }}-node-v${{ env.NODE }}-${{ hashFiles('package.json') }}-${{ hashFiles('package-lock.json') }}-${{ hashFiles('.github/workflows/ci.yml') }}
+          restore-keys: |
+            ${{ runner.OS }}-node-v${{ env.NODE }}-${{ hashFiles('package.json') }}-${{ hashFiles('package-lock.json') }}-${{ hashFiles('.github/workflows/ci.yml') }}
+
+      - name: Set up Bundler
+        run: gem install bundler -v "~> 1.17"
+
+      - run: ruby --version
+      - run: gem --version
+      - run: bundle --version
+      - run: node --version
+      - run: npm --version
+      - run: java -version
+
+      - name: Install npm dependencies
+        run: npm ci
+
+      - name: Install bundler dependencies
+        run: bundle install --deployment --jobs=4 --retry=3 --clean
+
+      - name: Run tests
+        run: npm test

README.md

@@ -1,7 +1,6 @@
 # The source code of <https://mpc-hc.org/>
 
-[![Linux Build Status](https://img.shields.io/travis/mpc-hc/mpc-hc.org/master.svg?label=Linux%20build)](https://travis-ci.org/mpc-hc/mpc-hc.org)
-[![Windows Build Status](https://img.shields.io/appveyor/ci/XhmikosR/mpc-hc-org/master.svg?label=Windows%20build)](https://ci.appveyor.com/project/XhmikosR/mpc-hc-org/branch/master)
+[![Build Status](https://github.com/mpc-hc/mpc-hc.org/workflows/CI/badge.svg)](https://github.com/mpc-hc/mpc-hc.org/actions?workflow=CI)
 [![devDependencies Status](https://img.shields.io/david/dev/mpc-hc/mpc-hc.org.svg)](https://david-dm.org/mpc-hc/mpc-hc.org?type=dev)
 
 ## Getting started