ci: Add build test for x86_64-fortanix-unknown-sgx target

.github/workflows/ci.yml

@@ -49,6 +49,7 @@ jobs:
       - loom-compile
       - check-readme
       - test-hyper
+      - x86_64-fortanix-unknown-sgx
       - wasm32-unknown-unknown
       - wasm32-wasi
       - check-external-types
@@ -452,6 +453,23 @@ jobs:
           git diff
           cargo test --features full
 
+  x86_64-fortanix-unknown-sgx:
+    name: build tokio for x86_64-fortanix-unknown-sgx
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install Rust ${{ env.rust_nightly }}
+        uses: actions-rs/toolchain@v1
+        with:
+          toolchain: ${{ env.rust_nightly }}
+          target: x86_64-fortanix-unknown-sgx
+          override: true
+      - uses: Swatinem/rust-cache@v1
+      # NOTE: Currently the only test we can run is to build tokio with rt and sync features.
+      - name: build tokio
+        run: cargo build --target x86_64-fortanix-unknown-sgx --features rt,sync
+        working-directory: tokio
+
   wasm32-unknown-unknown:
     name: test tokio for wasm32-unknown-unknown
     runs-on: ubuntu-latest