Add GitHub Actions for CI

Signed-off-by: Hiroshi Hatake <[email protected]>

Author: cosmo0920

.github/workflows/linux.yml

@@ -0,0 +1,26 @@
+name: Testing on Ubuntu
+on:
+  - push
+  - pull_request
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: [ '2.4', '2.5', '2.6', '2.7' ]
+        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 test

.github/workflows/macos.yml

@@ -0,0 +1,26 @@
+name: Testing on macOS
+on:
+  - push
+  - pull_request
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: [ '2.4', '2.5', '2.6', '2.7' ]
+        os:
+          - macOS-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 test