Add SwiftWASM to CI (#32)

* Add SwiftWASM to CI

* wip

* wip

* wip

Author: stephencelis

.github/workflows/ci.yml

@@ -24,3 +24,17 @@ jobs:
     - uses: actions/checkout@v2
     - name: Run tests
       run: make test
+  wasm:
+     name: SwiftWASM
+     runs-on: ubuntu-latest
+     strategy:
+       matrix:
+         include:
+           - { toolchain: wasm-5.6.0-RELEASE }
+
+     steps:
+       - uses: actions/checkout@v2
+       - run: echo "${{ matrix.toolchain }}" > .swift-version
+       - uses: swiftwasm/[email protected]
+         with:
+           shell-action: swift build