Merge pull request #90 from fluent/migrate-ci

Migrate CI from Travis CI to GitHub Actions

.github/workflows/linux.yml

@@ -0,0 +1,31 @@
+name: linux
+on:
+  - push
+  - pull_request
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby:
+          - '2.4'
+          - '2.5'
+          - '2.6'
+          - '2.7'
+          - '3.0'
+        os:
+          - ubuntu-latest
+    name: Ruby ${{ matrix.ruby }} unit testing on ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+    - name: unit testing
+      env:
+        CI: true
+      run: |
+        gem install bundler rake
+        bundle install --jobs 4 --retry 3
+        bundle exec rake spec

fluent-logger.gemspec

@@ -27,4 +27,5 @@ Gem::Specification.new do |gem|
   gem.add_development_dependency 'rspec-its', '>= 1.1.0'
   gem.add_development_dependency 'simplecov', '>= 0.5.4'
   gem.add_development_dependency 'timecop', '>= 0.3.0'
+  gem.add_development_dependency 'webrick'
 end