ci: use lld linker for ci (#398)

* ci: use lld linker for ci

* ci: do a disk cleanup before test

* ci: add llvm cache to speedup installation

* ci: use lld linker for coverage as well

* feat: use lld for release too

.github/workflows/develop.yml

@@ -47,7 +47,17 @@ jobs:
     timeout-minutes: 60
     steps:
       - uses: actions/checkout@v2
+      - name: Cache LLVM and Clang
+        id: cache-llvm
+        uses: actions/cache@v3
+        with:
+          path: ./llvm
+          key: llvm
       - uses: arduino/setup-protoc@v1
+      - uses: KyleMayes/install-llvm-action@v1
+        with:
+          version: "14.0"
+          cached: ${{ steps.cache-llvm.outputs.cache-hit }}
       - uses: actions-rs/toolchain@v1
         with:
           profile: minimal
@@ -55,11 +65,16 @@ jobs:
           override: true
       - name: Rust Cache
         uses: Swatinem/rust-cache@v2.0.0
+      - name: Cleanup disk
+        uses: curoky/cleanup-disk-action@v2.0
+        with:
+          retain: 'rust,llvm'
       - uses: actions-rs/cargo@v1
         with:
           command: test
           args: --workspace
         env:
+          CARGO_BUILD_RUSTFLAGS: "-C link-arg=-fuse-ld=lld"
           RUST_BACKTRACE: 1
           GT_S3_BUCKET: ${{ secrets.S3_BUCKET }}
           GT_S3_ACCESS_KEY_ID: ${{ secrets.S3_ACCESS_KEY_ID }}