Split ruby.yml, revise Actions (#2114)

.github/workflows/ruby.yml

@@ -5,7 +5,7 @@ on: [push, pull_request]
 jobs:
   build:
     name: >-
-      ${{ matrix.os }}  Ruby: ${{ matrix.ruby }}
+      ${{ matrix.os }}, ${{ matrix.ruby }}
     env:
       CI: true
       TESTOPTS: -v
@@ -14,45 +14,93 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-18.04, macos, windows-latest ]
-        ruby: [ 2.3, 2.4, 2.5, 2.6, 2.7 ]
-        exclude:
-          - os: windows-latest
-            ruby: 2.3
+        os: [ ubuntu-18.04, macos ]
+        ruby: [ 2.3, 2.4, 2.5, 2.6, 2.7, ruby-head ]
 
     steps:
-    - name: repo checkout
-      uses: actions/checkout@v2
+      - name: repo checkout
+        uses: actions/checkout@v2
 
-    - name: load ruby
-      uses: ruby/setup-ruby@v1
-      with:
-        ruby-version: ${{ matrix.ruby }}
+      - name: load ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
 
-    - name: ubuntu & macos - install ragel
-      if:   startsWith(matrix.os, 'ubuntu') || startsWith(matrix.os, 'macos')
-      run:  |
-        if [ "${{ matrix.os }}" == "macos" ]; then
-          brew install ragel
-        else
-          sudo apt-get -qy install ragel
-        fi
+      - name: ubuntu & macos - install ragel
+        if:   startsWith(matrix.os, 'ubuntu') || startsWith(matrix.os, 'macos')
+        run:  |
+          if [ "${{ matrix.os }}" == "macos" ]; then
+            brew install ragel
+          else
+            sudo apt-get -qy install ragel
+          fi
 
-    - name: windows - update MSYS2, openssl, ragel
-      if:   startsWith(matrix.os, 'windows')
-      uses: MSP-Greg/msys2-action@master
-      with:
-        base:  update
-        mingw: openssl ragel
+      - name: bundle install
+        run:  bundle install --jobs 4 --retry 3
+      - name: compile
+        run:  bundle exec rake compile
 
-    - name: RubyGems, Bundler Update
-      run:  gem update --system --no-document --conservative
-    - name: bundle install
-      run:  bundle install --jobs 4 --retry 3
-    - name: compile
-      run:  bundle exec rake compile
-    - name: test
-      run:  bundle exec rake
-      env:
-        RUBYOPT: --enable-frozen-string-literal
-      timeout-minutes: 10
+      # two test steps due to pre-installed Bundler not working with
+      # frozen strings before 2.0
+
+      - name: test with frozen string
+        timeout-minutes: 10
+        env:
+          RUBYOPT: --enable-frozen-string-literal
+        if: matrix.ruby >= '2.6'
+        run:  bundle exec rake
+
+      - name: test without frozen string
+        timeout-minutes: 10
+        if: matrix.ruby < '2.6'
+        run:  bundle exec rake
+
+  win32:
+    name: >-
+      ${{ matrix.os }}, ${{ matrix.ruby }}
+    env:
+      CI: true
+      TESTOPTS: -v
+
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ windows-latest ]
+        ruby: [ 2.3, 2.4, 2.5, 2.6, 2.7, ruby-head ]
+
+    steps:
+      - name: repo checkout
+        uses: actions/checkout@v2
+
+      - name: windows - update MSYS2, openssl, ragel
+        if:   startsWith(matrix.os, 'windows')
+        uses: MSP-Greg/actions-ruby@v1
+        with:
+          base:  update
+          mingw: openssl ragel
+          ruby-version: ${{ matrix.ruby }}
+
+      - name: bundle install
+        run:  bundle install --jobs 4 --retry 3
+
+      - name: compile
+        if:   matrix.ruby >= '2.4'
+        run:  bundle exec rake compile
+
+      # Ruby 2.3 uses a OpenSSL package that is not MSYS2
+      - name: compile
+        if:   matrix.ruby == '2.3'
+        run:  bundle exec rake compile -- --with-openssl-dir=C:/openssl-win
+
+      - name: test with frozen string
+        timeout-minutes: 10
+        env:
+          RUBYOPT: --enable-frozen-string-literal
+        if: matrix.ruby >= '2.6'
+        run:  bundle exec rake
+
+      - name: test without frozen string
+        timeout-minutes: 10
+        if: matrix.ruby < '2.6'
+        run:  bundle exec rake