Setup matrix

Author: kateinoigakukun

.github/workflows/test.yml

@@ -3,7 +3,13 @@ on: [push, pull_request]
 jobs:
   test:
     name: Build and Test
-    runs-on: macOS-10.15
+    strategy:
+      matrix:
+        os: [macOS-10.15, ubuntu-18.04]
+        include:
+          - os: macOS-10.15
+            toolchain: https://github.com/swiftwasm/swift/releases/download/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-03-08-a/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-03-08-a-osx.tar.gz
+    runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout
         uses: actions/checkout@master
@@ -19,4 +25,4 @@ jobs:
           make bootstrap
           make test
         env:
-          TOOLCHAIN_DOWNLOAD: https://github.com/swiftwasm/swift/releases/download/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-03-08-a/swift-wasm-DEVELOPMENT-SNAPSHOT-2020-03-08-a-osx.tar.gz
+          TOOLCHAIN_DOWNLOAD: ${{ matrix.toolchain }}