[bazel] Enable windows builds?

.github/workflows/bazel.yml

@@ -10,11 +10,6 @@ on:
       - main
   workflow_dispatch:
 
-concurrency:
-  # Cancel previous actions from the same PR or branch except 'main' branch.
-  # See https://docs.github.com/en/actions/using-jobs/using-concurrency and https://docs.github.com/en/actions/learn-github-actions/contexts for more info.
-  group: concurrency-group::${{ github.workflow }}::${{ github.event.pull_request.number > 0 && format('pr-{0}', github.event.pull_request.number) || github.ref_name }}${{ github.ref_name == 'main' && format('::{0}', github.run_id) || ''}}
-  cancel-in-progress: ${{ github.ref_name != 'main' }}
 jobs:
   test:
     strategy:
@@ -36,9 +31,10 @@ jobs:
             target: aarch64-unknown-linux-musl
           - os: ubuntu-24.04
             target: x86_64-unknown-linux-musl
-          # TODO: Enable Windows once we fix the toolchain issues there.
-          #- os: windows-latest
-          #  target: x86_64-pc-windows-gnullvm
+
+          # Windows
+          - os: windows-latest
+            target: x86_64-pc-windows-gnullvm
     runs-on: ${{ matrix.os }}
 
     # Configure a human readable name for each job
@@ -95,7 +91,7 @@ jobs:
         shell: pwsh
         run: |
           # Use a very short path to reduce argv/path length issues.
-          "BAZEL_STARTUP_ARGS=--output_user_root=C:\" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
+          "BAZEL_STARTUP_ARGS=--output_user_root=D:\" | Out-File -FilePath $env:GITHUB_ENV -Encoding utf8 -Append
 
       - name: bazel test //...
         env:

.github/workflows/ci.bazelrc

@@ -1,6 +1,13 @@
 common --remote_download_minimal
-common --nobuild_runfile_links
 common --keep_going
+common --verbose_failures
+
+# Disable disk cache since we have remote one and aren't using persistent workers.
+common --disk_cache=
+
+# Rearrange caches on Windows so they're on the same volume as the checkout.
+common:windows --repo_contents_cache=D:/a/.cache/bazel-repo-contents-cache
+common:windows --repository_cache=D:/a/.cache/bazel-repo-cache
 
 # We prefer to run the build actions entirely remotely so we can dial up the concurrency.
 # We have platform-specific tests, so we want to execute the tests on all platforms using the strongest sandboxing available on each platform.
@@ -16,5 +23,5 @@ common:macos --config=remote
 common:macos --strategy=remote
 common:macos --strategy=TestRunner=darwin-sandbox,local
 
-common:windows --strategy=TestRunner=local
-
+# On windows we can not cross-build the tests but run them locally due to what appears to be a Bazel bug
+# (windows vs unix path confusion)