Add build_test_all_windows CI job. (#11050)

Progress on #11009

Sample successful run:
https://github.com/iree-org/iree/actions/runs/3448018286/jobs/5754640528

At first this will only run on postsubmit, then we can move this to
presubmit if it is stable and we have enough resources. We should also
keep an eye on how long this takes to run (checkout seems to take
substantially longer than on Linux), and also consider using Docker to
manage the dependencies and environment.

Notes:
* This does not test Vulkan or CUDA - we'd want a runner with a physical
GPU (or SwiftShader) for that
* This downloads CUDA deps on demand via CMake (so there's some
additional network activity)

.github/workflows/ci.yml

@@ -152,6 +152,35 @@ jobs:
           gcloud alpha storage cp "${BUILD_DIR_ARCHIVE}" "${BUILD_DIR_GCS_ARTIFACT}"
           echo "::set-output name=build-dir-gcs-artifact::${BUILD_DIR_GCS_ARTIFACT}"
 
+  build_test_all_windows:
+    needs: setup
+    if: needs.setup.outputs.should-run == 'true' && needs.setup.outputs.ci-stage == 'postsubmit'
+    runs-on: managed-windows-cpu
+    defaults:
+      run:
+        shell: bash
+    env:
+      BUILD_DIR: build-windows
+      IREE_VULKAN_DISABLE: 1
+    steps:
+      - name: "Checking out repository"
+        uses: actions/checkout@7884fcad6b5d53d10323aee724dc68d8b9096a2e # v2
+        with:
+          submodules: true
+      - name: "Setting up Python"
+        uses: actions/setup-python@7f80679172b057fc5e90d70d197929d454754a5a # v2
+      - name: "Installing Python packages"
+        run: |
+          python3 -m venv .venv
+          .venv/Scripts/activate.bat
+          python3 -m pip install -r runtime/bindings/python/iree/runtime/build_requirements.txt
+      - name: "Configuring MSVC"
+        uses: ilammy/msvc-dev-cmd@7315a94840631165970262a99c72cfb48a65d25d # v1.12.0
+      - name: "Building IREE"
+        run: ./build_tools/cmake/build_all.sh "${BUILD_DIR}"
+      - name: "Testing IREE"
+        run: ./build_tools/cmake/ctest_all.sh "${BUILD_DIR}"
+
   build_test_all_bazel:
     needs: setup
     if: needs.setup.outputs.should-run == 'true'
@@ -745,6 +774,7 @@ jobs:
     needs:
       # Basic
       - build_all
+      - build_test_all_windows
       - build_test_all_bazel
       - test_all
       - test_gpu