Rewrite Travis CI as Github Actions; add Sidekiq versions

Author: rnubel

.github/workflows/test.yml

@@ -0,0 +1,26 @@
+name: Test
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        ruby-version: ['3.1', '2.7']
+        sidekiq-version: ['4', '5', '6.0', '6.1', '6.x']
+
+    steps:
+      - uses: actions/checkout@v3
+      - name: Set up Ruby ${{ matrix.ruby-version }}
+        uses: ruby/setup-ruby@359bebbc29cbe6c87da6bc9ea3bc930432750108
+        with:
+          ruby-version: ${{ matrix.ruby-version }}
+      - name: Install dependencies
+        run: bundle install --gemfile=gemfiles/sidekiq_${{ matrix.sidekiq-version }}.gemfile
+      - name: Run tests
+        run: bundle exec rake

.travis.yml

@@ -0,0 +1,5 @@
+source "https://rubygems.org"
+
+gem 'sidekiq', '~> 6.0.0'
+
+gemspec path: '../'

gemfiles/sidekiq_6.0.gemfile

@@ -0,0 +1,5 @@
+source "https://rubygems.org"
+
+gem 'sidekiq', '~> 6.1.0'
+
+gemspec path: '../'

gemfiles/sidekiq_6.1.gemfile

@@ -1,5 +1,5 @@
 source "https://rubygems.org"
 
-gem 'sidekiq', '~> 6.0'
+gem 'sidekiq', '~> 6.5'
 
 gemspec path: '../'