add github check workflow

Change-Id: Iad9c4718ee80a7d16d461ab12e447134c604243e

.bazelignore

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+example

.github/workflows/check.yml

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+name: check
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ "*" ]
+    types: [synchronize, opened, reopened, edited]
+  workflow_dispatch:
+
+jobs:
+  buildifier:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - shell: bash
+        run: |
+          bazel run //tools:buildifier.check
+
+  check-tidy:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        bazel:
+          #- latest
+          - 7.x
+          #- 6.x
+          #- 5.x
+        compiler:
+          - clang-18
+          #- clang-17
+          #- clang-16
+          #- clang-15
+          #- clang-14
+        example:
+          - misc-unused-alias-decls
+
+    steps:
+      - name: install ${{ matrix.compiler }}
+        shell: bash
+        run: |
+          version=$(echo ${{ matrix.compiler }} | cut -d'-' -f2)
+
+          wget https://apt.llvm.org/llvm.sh
+          chmod +x llvm.sh
+          sudo ./llvm.sh $version
+
+          sudo ln -sf $(which clang-tidy-$version) /usr/bin/clang-tidy
+
+          clang-tidy --version
+          clang-tidy-$version --version
+
+          ls -al /usr/bin
+
+      - uses: actions/checkout@v4
+
+      - name: run clang-tidy
+        shell: bash
+        env:
+          USE_BAZEL_VERION: ${{ matrix.bazel }}
+          CC: ${{ matrix.compiler }}
+        run: |
+          cd example/${{ matrix.example }}
+
+          if [[ "${{ matrix.bazel }}" < 6 ]]; then
+            sed -i '/enable_bzlmod/d' .bazelrc
+          fi
+
+          bazel build --announce_rc --config=clang-tidy --color=yes //... | tee log || true
+          grep "error: .*${{ matrix.example }}" log
+
+  all:
+    runs-on: ubuntu-latest
+    if: ${{ github.base_ref == 'main' }}
+    needs:
+      - buildifier
+      - check-tidy
+    steps:
+    - run: true

example/misc-unused-alias-decls/.bazelrc

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+common --enable_bzlmod=false
+
+build:clang-tidy --aspects=@rules_clang_tidy//:aspects.bzl%check
+build:clang-tidy --output_groups=report
+

example/misc-unused-alias-decls/BUILD.bazel

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+cc_binary(
+    name = "main",
+    srcs = ["main.cpp"],
+)

example/misc-unused-alias-decls/WORKSPACE.bazel

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+local_repository(
+    name = "rules_clang_tidy",
+    path = "../..",
+)

example/misc-unused-alias-decls/main.cpp

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+#include <iostream>
+
+namespace std2 = ::std;
+
+auto main() -> int
+{
+    std::cout << "hello, world!" << '\n';
+}