Updated GitHub CI

Author: colemancda

.github/workflows/swift.yml

@@ -2,12 +2,35 @@ name: Swift
 on: [push]
 jobs:
 
-  build:
-    name: Build
+  macos:
+    name: macOS
+    strategy:
+      matrix:
+        swift: [5.7.1]
+        os: [macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Install Swift
+      uses: slashmo/install-swift@v0.3.0
+      with:
+        version: ${{ matrix.swift }}
+    - name: Checkout
+      uses: actions/checkout@v2
+    - name: Swift Version
+      run: swift --version
+    - name: Build (Debug)
+      run: swift build -c debug
+    - name: Build (Release)
+      run: swift build -c release
+    - name: Test (Debug)
+      run: swift test -c debug
+  
+  linux:
+    name: Linux
     strategy:
       matrix:
         swift: [5.6.3, 5.7.1]
-        os: [macos-latest, ubuntu-latest]
+        os: [ubuntu-latest]
     runs-on: ${{ matrix.os }}
     steps:
     - name: Install Swift
@@ -23,4 +46,4 @@ jobs:
     - name: Build (Release)
       run: swift build -c release
     - name: Test (Debug)
-      run: swift test -c debug
+      run: swift test -c debug