use GA

.github/workflows/actions.yml

@@ -0,0 +1,23 @@
+name: CI
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    services:
+      mysql:
+        image: mysql
+    strategy:
+      matrix:
+        ruby: [ '2.5', '2.6', '2.7' ]
+    name: ${{ matrix.ruby }} rake ${{ matrix.task }}
+    steps:
+    - uses: actions/checkout@v2
+    - uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby }}
+        bundler-cache: true # runs 'bundle install' and caches installed gems automatically
+    - run: bundle exec rake

spec/parallel_spec.rb

@@ -189,7 +189,7 @@ def cpus
     end
 
     it "does not open unnecessary pipes" do
-      max = (RbConfig::CONFIG["target_os"].include?("darwin1") ? 10 : 1500) # somehow super bad on travis
+      max = (RbConfig::CONFIG["target_os"].include?("darwin1") ? 10 : 1800) # somehow super bad on CI
       `ruby spec/cases/count_open_pipes.rb`.to_i.should < max
     end
   end