Add MacOS CI back

Signed-off-by: Yang Zhang <yang.zhang@pingcap.com>

Author: v01dstar

.github/workflows/rust.yml

@@ -15,9 +15,43 @@ env:
   CARGO_TERM_COLOR: always
 
 jobs:
-  # The macOS nightly CI job was removed because grpc-io 0.13 fails with the
-  # macOS C++ toolchain. Without a committed Cargo.lock, we cannot pin
-  # grpc-io to 0.10 as a workaround.
+  nightly:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        # tests with sanitizer on `ubuntu-latest` is supported by 
+        # self-defined `nihtly test` job, so we don't need to test it here.
+        os: [ macos-latest ]
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          ref: ${{ github.event.pull_request.head.sha }}
+      - name: Install nightly toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: nightly-2026-01-30
+          override: true
+          components: rustfmt, clippy, rust-src
+      - uses: Swatinem/rust-cache@v1
+        with:
+          sharedKey: ${{ matrix.os }}
+      - name: Cache dependencies
+        if: ${{ matrix.os == 'ubuntu-latest' }}
+        run: if [[ ! -e ~/.cargo/bin/grcov ]]; then cargo install grcov; fi
+      - name: Format
+        run: |
+          make format
+          git diff --exit-code
+      - name: Clippy
+        run: make clippy
+        env:
+          EXTRA_CARGO_ARGS: '--fix'
+      - name: Run tests
+        run: make test
+        env:
+          RUST_BACKTRACE: 1
+          EXTRA_CARGO_ARGS: '--verbose'
   stable:
     runs-on: ${{ matrix.os }}
     strategy:
@@ -49,7 +83,7 @@ jobs:
           WITH_STABLE_TOOLCHAIN: 'force'
   coverage:
     runs-on: ubuntu-latest
-    needs: stable
+    needs: nightly
     steps:
       - uses: actions/checkout@v2
         with: