ci: add windows coverage

Author: alexeagle

.bcr/presubmit.yml

@@ -3,7 +3,7 @@ bcr_test_module:
   matrix:
     bazel: ["6.x", "7.x"]
     # TODO(#97): add windows
-    platform: ["debian10", "ubuntu2004"]
+    platform: ["debian10", "ubuntu2004", "windows"]
   tasks:
     test_linux:
       name: "Run test module"

.github/workflows/ci.yaml

@@ -43,8 +43,13 @@ jobs:
         run: echo "os=macos-13" >> $GITHUB_OUTPUT
         # Don't run MacOS if there is no TestContainers API token which is the case on forks. We need it for container tests.
         if: ${{ env.TC_CLOUD_TOKEN != '' }}
+      - id: windows
+        run: echo "os=windows-latest" >> $GITHUB_OUTPUT
+        # Only run on main branch (not PRs) to minimize windows minutes (billed at 2X)
+        # https://docs.github.com/en/billing/managing-billing-for-github-actions/about-billing-for-github-actions#included-storage-and-minutes
+        if: (github.ref == 'refs/heads/main' || contains(github.head_ref, 'windows'))
     outputs:
-      # Will look like ["ubuntu-latest", "macos-13"]
+      # Will look like ["ubuntu-latest", "macos-latest", "windows-latest"]
       os: ${{ toJSON(steps.*.outputs.os) }}
 
   test:
@@ -77,9 +82,18 @@ jobs:
           # e2e/assertion is bzlmod only but it has test for both cases.
           - folder: e2e/assertion
             bzlmodEnabled: false
+          # Windows is mostly broken, so we allow-list below instead.
+          - os: windows-latest
+            bzlmodEnabled: false
           # TODO: fix
           - folder: e2e/wasm
             bzlmodEnabled: true
+        include:
+          # This is approx. what the BCR presubmit will run
+          - os: windows-latest
+            bzlmodEnabled: true
+            folder: e2e/smoke
+
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
       # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
@@ -162,7 +176,7 @@ jobs:
           XDG_CACHE_HOME: ~/.cache/bazel-repo
         run: |
           bazel \
-          --bazelrc=$GITHUB_WORKSPACE/.github/workflows/ci.bazelrc \
+          --bazelrc=${{ github.workspace }}/.github/workflows/ci.bazelrc \
           --bazelrc=.bazelrc  \
           test //... \
           ${{ steps.set_bzlmod_flag.outputs.bzlmod_flag }} \