Add sgx target to ci

Author: nhynes

.github/workflows/main.yml

@@ -183,7 +183,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        target: [wasm32-unknown-unknown, x86_64-fuchsia]
+        target: [wasm32-unknown-unknown, wasm32-wasi, x86_64-fuchsia, x86_64-fortanix-unknown-sgx]
     steps:
     - uses: actions/checkout@master
       with: