Update swift.yml

Author: fewlinesofcode

.github/workflows/swift.yml

@@ -16,7 +16,12 @@ jobs:
     - name: Build
       run: swift build -v
 
-- uses: actions/checkout@v1
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
       - name: Generate Documentation
         uses: SwiftDocOrg/swift-doc@master
         with:
@@ -29,3 +34,4 @@ jobs:
           path: "Documentation"
         env:
           GH_PERSONAL_ACCESS_TOKEN: ${{ secrets.DOCUMENTATION_SECRET }}
+