Cache Android toolchain before test builds

Author: nekohasekai

.github/workflows/naive-build.yml

@@ -361,6 +361,17 @@ jobs:
         run: |
           go run ./cmd/build-naive --target=android/${{ matrix.arch }} package --local
           go run ./cmd/build-naive --target=android/${{ matrix.arch }} package
+      - name: Cache toolchain
+        uses: actions/cache@v4
+        with:
+          path: |
+            naiveproxy/src/third_party/llvm-build
+            naiveproxy/src/gn/out
+            naiveproxy/src/chrome/build/pgo_profiles
+          key: toolchain-android-${{ matrix.arch }}-${{ steps.chromium.outputs.version }}-${{ steps.clang.outputs.version }}-${{ env.CACHE_EPOCH }}
+          restore-keys: toolchain-android-${{ matrix.arch }}-${{ steps.chromium.outputs.version }}-${{ steps.clang.outputs.version }}-${{ env.CACHE_EPOCH }}-
+      - name: Download toolchain
+        run: go run ./cmd/build-naive --target=android/${{ matrix.arch }} download-toolchain
       - name: Setup Android NDK
         uses: nttld/setup-ndk@v1
         id: setup-ndk