Install bleeding edge clang

.github/workflows/native_toolchain_c.yaml

@@ -0,0 +1,55 @@
+name: dart
+permissions: read-all
+
+on:
+  pull_request:
+    branches: [main]
+    paths:
+      - ".github/workflows/dart.yaml"
+      - "pkgs/native_toolchain_c/**"
+  push:
+    branches: [main]
+    paths:
+      - ".github/workflows/dart.yaml"
+      - "pkgs/native_toolchain_c/**"
+  schedule:
+    - cron: "0 0 * * 0" # weekly
+
+jobs:
+  clang-bleeding-edge:
+    strategy:
+      matrix:
+        os: [ubuntu]
+        sdk: [stable]
+        package: [native_toolchain_c]
+
+    runs-on: ${{ matrix.os }}-latest
+
+    defaults:
+      run:
+        working-directory: pkgs/${{ matrix.package }}
+
+    steps:
+      - uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744
+
+      - uses: dart-lang/setup-dart@d6a63dab3335f427404425de0fbfed4686d93c4f
+        with:
+          sdk: ${{ matrix.sdk }}
+
+      - uses: nttld/setup-ndk@dbacc5871a0fac6eef9a09d2ca86bc8bf79432c3
+        with:
+          ndk-version: r25b
+        if: ${{ matrix.sdk == 'stable' }}
+
+      - run: dart pub get
+
+      - name: Download clang
+        run: curl https://storage.googleapis.com/chrome-infra-packages/store/SHA256/33c37f2289b1bb64755c8ae27e173a6934d08c86674221bb64f5966ba50a9f2a?Expires=1694770717&GoogleAccessId=chrome-infra-packages%40appspot.gserviceaccount.com&Signature=qOT43Za7fTznfe8SRBRyqBlwnERkIkRMTGXorJxqRgBaiSAuB9Fv%2Fm7ZrNf8thRWYrGDaxoMbWs3RQ%2BxxUtdOVIjpPwN9Zd2SOPqq35M4Pif7ukyU6oiZuHb%2BqZkMDQv8TALT7SsXJYvEOBMvGhUjXIwTsesJANL2pQ6NZ695xzhZG5oxkus4sC4dhSmte3iJanHIWfnLsVYhbuD%2FI4DXuJQTgBYsYj62gVwmigze0tRUG%2B4oubS6FrGDK49AMl3H8oku1pkKxbSt9vRw%2BeDxyWwJrnCsQGR4OyIlZy5FTVZ9PMYLMptMChNA%2F7jGUHa6hCLhmISmLtXvPRANzcQcw%3D%3D&response-content-disposition=attachment%3B+filename%3D%22clang-linux-amd64.zip%22
+
+        # TODO: use       # https://docs.github.com/en/actions/using-workflows/workflow-commands-for-github-actions#adding-a-system-path
+      - name: Install native toolchains
+        run: sudo apt-get update && sudo apt-get install clang-15 gcc-i686-linux-gnu gcc-aarch64-linux-gnu gcc-arm-linux-gnueabihf
+        if: ${{ matrix.sdk == 'stable' && matrix.os == 'ubuntu' }}
+
+      - run: dart test
+        if: ${{ matrix.sdk == 'stable' }}