Add jobs for Windows

.github/workflows/gazelle_examples.yaml

@@ -14,12 +14,19 @@ jobs:
       matrix:
         runs-on:
           - ubuntu-latest
+          - windows-latest
 
     runs-on: ${{ matrix.runs-on }}
 
     steps:
       - uses: actions/checkout@v3
 
+      # The windows-latest image comes with Java 8 but rules_jvm_external requires at least 11, so we install a newer JDK.
+      - uses: actions/setup-java@v4
+        with:
+          distribution: "zulu"
+          java-version: "21"
+
       - uses: bazelbuild/setup-bazelisk@v2
 
       - name: Mount bazel action cache

.github/workflows/tests.yaml

@@ -16,6 +16,7 @@ jobs:
     strategy:
       matrix:
         runs-on:
+          # Most of the tests don't run on Windows, so we have a separate job for running just the ones that do.
           - ubuntu-latest
         flags:
           - ""

.github/workflows/tests_windows.yaml

@@ -0,0 +1,48 @@
+name: Tests (Windows)
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+jobs:
+  # We don't run the tests in the main test job because most of them don't work on Windows, but the Gazelle ones should, so we run those.
+  test_windows:
+    strategy:
+      matrix:
+        runs-on:
+          - windows-latest
+
+    runs-on: ${{ matrix.runs-on }}
+
+    steps:
+      - uses: actions/checkout@v3
+
+      # The windows-latest image comes with Java 8 but rules_jvm_external requires at least 11, so we install a newer JDK.
+      - uses: actions/setup-java@v4
+        with:
+          distribution: "zulu"
+          java-version: "21"
+
+      - uses: bazelbuild/setup-bazelisk@v2
+
+      - name: Mount bazel action cache
+        uses: actions/cache@v2
+        with:
+          path: "~/.cache/bazel"
+          key: bazel
+
+      - name: Mount bazel repo cache
+        uses: actions/cache@v2
+        with:
+          path: "~/.cache/bazel-repo"
+          key: bazel-repo
+
+      - name: bzlmod gazelle
+        env:
+          # Bazelisk will download bazel to here, ensure it is cached between runs.
+          XDG_CACHE_HOME: ~/.cache/bazel-repo
+        run: bazelisk --bazelrc=.github/workflows/ci.bazelrc test //java/gazelle/...