Migrate CI pipeline to GitHub Actions

Author: yoshoku

.github/workflows/build.yml

@@ -0,0 +1,28 @@
+name: build
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: [ '2.5', '2.6', '2.7' ]
+    steps:
+      - uses: actions/checkout@v2
+      - name: Install BLAS and LAPACK
+        run: sudo apt-get install -y libopenblas-dev liblapacke-dev
+      - name: Set up Ruby ${{ matrix.ruby }}
+        uses: actions/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+      - name: Build and Install
+        run: |
+          gem install --no-document bundler
+          gem install --no-document specific_install
+          bundle install --jobs 4 --retry 3
+          gem build numo-linalg.gemspec
+          gem install numo-linalg-*.gem
+      - name: Tests
+        run: rspec --color --format documentation --require spec_helper spec

.travis.yml

@@ -1,7 +1,7 @@
 # Numo::Linalg : Linear Algebra library with BLAS/LAPACK binding to Numo::NArray
 
 [![Binder](http://mybinder.org/badge.svg)](http://mybinder.org/repo/ruby-numo/numo-linalg)
-[![Build Status](https://travis-ci.org/ruby-numo/numo-linalg.svg?branch=master)](https://travis-ci.org/ruby-numo/numo-linalg)
+[![Build Status](https://github.com/ruby-numo/numo-linalg/workflows/build/badge.svg)](https://github.com/ruby-numo/numo-linalg/actions)
 
 [GitHub](https://github.com/ruby-numo/numo-linalg) |
 [RubyGems](https://rubygems.org/gems/numo-linalg)

README.md

@@ -7,21 +7,4 @@
     expect { described_class.load_library }.to_not raise_error
     expect(described_class.libs).to_not be_nil
   end
-
-  describe 'private method' do
-    let(:autoloader) do
-      class DummyLoader
-        include Numo::Linalg::Autoloader
-      end
-      DummyLoader.new
-    end
-
-    it 'finds BLAS/LAPACK libraries' do
-      lapack_libs = autoloader.send(:find_lapack_libs, ['/usr/lib', '/usr/local/lib', '/usr/local/opt/lapack/lib'])
-      expect(lapack_libs[:blas]).to_not be_nil
-      expect(lapack_libs[:cblas]).to_not be_nil
-      expect(lapack_libs[:lapack]).to_not be_nil
-      expect(lapack_libs[:lapacke]).to_not be_nil
-    end
-  end
 end