Split Windows and POSIX actions

.github/workflows/Windows.yml

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+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support documentation.
+# This workflow will download a prebuilt Ruby version, install dependencies and run tests with Rake
+# For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby
+
+name: Windows CI
+
+on:
+  push:
+    branches: [ "master", "rw8.0"]
+  pull_request:
+    branches: [ "master" ]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby-version: ['3.2', '3.3']
+        os: [windows-2022] # , windows-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Ruby # see https://github.com/ruby/setup-ruby#versioning)
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+    - name: Install Gems
+      run: bundle install
+    - name: Build and Test Iodine
+      run: |
+        echo CFLAGS = $CFLAGS
+        echo cflags = $cflags
+        echo HOME = $HOME
+        ruby -e 'puts Gem.default_dir'
+        env VERBOSE=1 bundle exec rake install --trace
+#       env VERBOSE=1 bundle exec rspec --format documentation
+#    - name: Run tests
+#      run: bundle exec rake

.github/workflows/posix.yml

@@ -0,0 +1,43 @@
+# This workflow uses actions that are not certified by GitHub.
+# They are provided by a third-party and are governed by
+# separate terms of service, privacy policy, and support documentation.
+# This workflow will download a prebuilt Ruby version, install dependencies and run tests with Rake
+# For more information see: https://github.com/marketplace/actions/setup-ruby-jruby-and-truffleruby
+
+name: POSIX CI
+
+on:
+  push:
+    branches: [ "master", "rw8.0"]
+  pull_request:
+    branches: [ "master" ]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby-version: ['3.2', '3.3']
+        os: [ubuntu-24.04, macos-14] # , windows-latest
+    runs-on: ${{ matrix.os }}
+    steps:
+    - uses: actions/checkout@v4
+    - name: Set up Ruby # see https://github.com/ruby/setup-ruby#versioning)
+      uses: ruby/setup-ruby@v1
+      with:
+        ruby-version: ${{ matrix.ruby-version }}
+    - name: Install Gems
+      run: bundle install
+    - name: Build and Test Iodine
+      run: |
+        echo CFLAGS = $CFLAGS
+        echo cflags = $cflags
+        echo HOME = $HOME
+        ruby -e 'puts Gem.default_dir'
+        sudo bundle exec rake install --trace
+#       env VERBOSE=1 bundle exec rspec --format documentation
+#    - name: Run tests
+#      run: bundle exec rake