Add Actions mswin, update CI

.github/workflows/rvm.yml_

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+name: OpenSSL
+
+on: [push, pull_request]
+
+jobs:
+  # tests RVM Ruby 2.3.8 and master
+  rvm:
+    name: >-
+      ${{ matrix.ruby }}  ubuntu rvm
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        cfg:
+          - { ruby: '2.3.8' , openssl: 'libssl1.0-dev' }
+          - { ruby: '2.7.0' , openssl: ''              }
+    steps:
+      - uses: actions/checkout@v2
+      - name: Set up RVM
+        run: |
+          curl -sSL https://get.rvm.io | bash
+      - name: Set up Ruby
+        run: |
+          source $HOME/.rvm/scripts/rvm
+          rvm install ${{ matrix.cfg.ruby }} --binary --autolibs=disable
+          rvm --default use ${{ matrix.cfg.ruby }}
+      - name: install openssl
+        if: matrix.cfg.openssl != ''
+        run: sudo apt-get -qy install ${{ matrix.cfg.openssl }}
+      - name: depends
+        run:  |
+          source $HOME/.rvm/scripts/rvm
+          rake install_dependencies
+      - name: compile
+        run:  |
+          source $HOME/.rvm/scripts/rvm
+          rake compile -- --enable-debug
+      - name: test
+        run:  |
+          source $HOME/.rvm/scripts/rvm
+          rake test TESTOPTS="-v --no-show-detail-immediately" OSSL_MDEBUG=1
+        env:
+          CI: true

.github/workflows/ubuntu-macos.yml

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+name: Ubuntu-macOS
+
+on: [push, pull_request]
+
+jobs:
+  build:
+    name: >-
+      ${{ matrix.ruby }}  ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ 'ubuntu-18.04', 'macos' ]
+        ruby: [ ruby-head, 2.7, 2.6, 2.5, 2.4, 2.3 ]
+    steps:
+      - name: repo checkout
+        uses: actions/checkout@v2
+
+      - name: load ruby
+        uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+
+      - name: depends
+        run:  rake install_dependencies
+
+      - name: compile
+        run:  rake compile -- --enable-debug
+
+      - name: test
+        run:  rake test TESTOPTS="-v --no-show-detail-immediately" OSSL_MDEBUG=1
+        env:
+          CI: true

.github/workflows/windows.yml

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+name: Windows
+
+on: [push, pull_request]
+
+jobs:
+  windows:
+    name: >-
+      ${{ matrix.ruby }}  windows-latest
+    runs-on: windows-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: [ mswin, mingw, 2.7, 2.6, 2.5, 2.4, 2.3 ]
+    steps:
+      - name: repo checkout
+        uses: actions/checkout@v2
+
+      - name: load ruby, update gcc, install openssl
+        uses: MSP-Greg/actions-ruby@mswin
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          base: update
+          mingw: openssl
+
+      - name: depends
+        run:  rake install_dependencies
+
+      - name: compile
+        shell: cmd
+        env:
+          RVERS: ${{ matrix.ruby }}
+        run:  |
+          if "%RVERS%" == "mswin" (
+            call "%VCVARS%"
+            rake compile -- --with-openssl-dir=C:/openssl-win --enable-debug
+          ) else (
+            if "%RVERS%" == "2.3" (
+              rake compile -- --with-openssl-dir=C:/openssl-win --enable-debug
+            ) else (
+              rake compile -- --enable-debug
+            )
+          )
+
+      - name: test
+        run:  rake test TESTOPTS="-v --no-show-detail-immediately" OSSL_MDEBUG=1
+        env:
+          CI: true