Add CI job with cmake build (but not tests yet) (#732)

Author: natecook1000

.github/workflows/pull_request.yml

@@ -25,6 +25,30 @@ jobs:
     uses: swiftlang/github-workflows/.github/workflows/swift_package_test.yml@main
     with:
       windows_exclude_swift_versions: "[{\"swift_version\": \"5.9\"}]"
+
+  cmake-build:
+    name: CMake Build
+    runs-on: ubuntu-latest
+    container:
+      image: swift:6.0-jammy
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v4
+      - name: Install apt dependencies
+        run: apt-get -qq update && apt-get -qq -y install curl ninja-build
+      - name: Install CMake 3.30.2
+        run: |
+          ARCH=`uname -m`
+          curl -sL https://github.com/Kitware/CMake/releases/download/v3.30.2/cmake-3.30.2-linux-$ARCH.tar.gz -O
+          tar xzf cmake-3.30.2-linux-$ARCH.tar.gz
+          export PATH="`pwd`/cmake-3.30.2-linux-$ARCH/bin:$PATH"
+          echo "PATH=$PATH" >> $GITHUB_ENV
+          cmake --version
+      - name: Configure CMake
+        run: cmake -GNinja -S . -B .cmake-build -DBUILD_EXAMPLES=1 -DBUILD_TESTING=0
+      - name: Build
+        run: cmake --build .cmake-build
+
   soundness:
     name: Soundness
     uses: swiftlang/github-workflows/.github/workflows/soundness.yml@main