ci: move ruby-head tests into upstream workflow

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
       fail-fast: false
       matrix:
         platform: [ubuntu-latest, windows-latest, macos-latest]
-        ruby: ["2.3", "2.4", "2.5", "2.6", "2.7", "3.0", "3.1", "3.2", "3.3", "head"]
+        ruby: ["2.3", "2.4", "2.5", "2.6", "2.7", "3.0", "3.1", "3.2", "3.3"]
         exclude:
           # I can't figure out how to install these on macos through setup-ruby
           - ruby: "2.3"

.github/workflows/upstream.yml

@@ -14,7 +14,26 @@ on:
       - .github/workflows/upstream.yml # this file
 
 jobs:
-  skeleton:
-    runs-on: ubuntu-latest
+  test-unit:
+    env:
+      MAKEFLAGS: -j2
+    strategy:
+      fail-fast: false
+      matrix:
+        platform: [ubuntu-latest, windows-latest, macos-latest]
+        ruby: ["head"]
+    runs-on: ${{ matrix.platform }}
     steps:
-      - run: echo "Hello, World!"
+      - name: configure git crlf on windows
+        if: matrix.platform == 'windows-latest'
+        run: |
+          git config --system core.autocrlf false
+          git config --system core.eol lf
+      - uses: actions/checkout@v4
+      - uses: MSP-Greg/setup-ruby-pkgs@v1
+        with:
+          apt-get: _update_ build-essential cmake
+          mingw: _upgrade_ cmake
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+      - run: bundle exec rake test:unit