Add linux action

.github/workflows/linux.yml

@@ -0,0 +1,21 @@
+name: Swift
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-18.04
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: Swift Package Build
+      run: swift build -v
+
+    - name: Run tests
+      run: swift test -v

.github/workflows/swift.yml → .github/workflows/macos.yml

@@ -21,4 +21,4 @@ jobs:
       run: swift build -v
 
     - name: Run tests
-      run: swift test -v
+      run: swift test -v