Add Windows test run exercising the Cargo build

PiperOrigin-RevId: 793698154

Author: acozzette

.github/workflows/test_rust.yml

@@ -58,3 +58,23 @@ jobs:
             ${{ matrix.bazel_cmd }} --crosstool_top=//toolchain:clang_suite  --cxxopt=-std=c++17 --host_cxxopt=-std=c++17 --@rules_rust//rust/settings:experimental_use_cc_common_link=True
             ${{ matrix.targets }} ${{ matrix.config.flags }}
 
+  windows:
+    strategy:
+      fail-fast: false   # Don't cancel all jobs if one fails.
+    name: Windows Cargo
+    runs-on: windows-2022
+    steps:
+      - name: Checkout pending changes
+        uses: protocolbuffers/protobuf-ci/checkout@v4
+        with:
+          ref: ${{ inputs.safe-checkout }}
+      - name: Install Rust
+        shell: bash
+        run: rustup default nightly-2025-08-07
+      - name: Run tests
+        uses: protocolbuffers/protobuf-ci/bazel@v4
+        with:
+          credentials: ${{ secrets.GAR_SERVICE_ACCOUNT }}
+          bazel: run //rust/release_crates:cargo_test
+          bazel-cache: windows-cargo
+          version: 8.0.1

rust/release_crates/cargo_test.sh

@@ -7,7 +7,7 @@
 
 # --- begin runfiles.bash initialization ---
 # Copy-pasted from Bazel's Bash runfiles library (tools/bash/runfiles/runfiles.bash).
-set -euo pipefail
+set -euxo pipefail
 if [[ ! -d "${RUNFILES_DIR:-/dev/null}" && ! -f "${RUNFILES_MANIFEST_FILE:-/dev/null}" ]]; then
     if [[ -f "$0.runfiles_manifest" ]]; then
     export RUNFILES_MANIFEST_FILE="$0.runfiles_manifest"
@@ -40,7 +40,13 @@ mkdir $WORKSPACE_ROOT
 WORKSPACE_TAR=$(rlocation com_google_protobuf/rust/release_crates/workspace.tar)
 
 echo "Expanding Cargo workspace tar"
-tar -xvf $WORKSPACE_TAR -C $WORKSPACE_ROOT
+
+# The tar binary on Windows does not know how to handle file paths that start
+# with C:\ or similar, so we go a little out of our way here to avoid passing
+# any paths as arguments to tar.
+pushd $WORKSPACE_ROOT
+tar -xv < $WORKSPACE_TAR
+popd
 
 # Put the Bazel-built protoc at the beginning of $PATH
 PATH=$(dirname $(rlocation com_google_protobuf/protoc)):$PATH