Switch from Travis CI to GitHub Actions

.github/workflows/ci.yml

@@ -0,0 +1,28 @@
+---
+name: CI
+on:
+  - pull_request
+  - push
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby:
+          - 2.5
+          - 2.6
+          - 2.7
+    env:
+      BUNDLE_WITHOUT: release
+    name: Ruby ${{ matrix.ruby }}
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Ruby ${{ matrix.ruby }}
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+      - name: Run tests
+        run: bundle exec rake test

.github/workflows/release.yml

@@ -0,0 +1,24 @@
+name: Release
+
+on:
+  create:
+    ref_type: tag
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    if: github.repository == 'voxpupuli/modulesync'
+    env:
+      BUNDLE_WITHOUT: release
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install Ruby 2.7
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: '2.7'
+      - name: Build gem
+        run: gem build *.gemspec
+      - name: Publish gem
+        run: gem push *.gem
+        env:
+          GEM_HOST_API_KEY: '${{ secrets.RUBYGEMS_AUTH_TOKEN }}'