optional swift

Author: inferrinizzard

.github/workflows/test-pr.yaml

@@ -3,7 +3,7 @@ on:
     pull_request:
         branches:
             - master
-            - 'release/**'
+            - "release/**"
 jobs:
     build:
         runs-on: ubuntu-22.04
@@ -89,6 +89,7 @@ jobs:
             - name: Setup Swift
               if: ${{ contains(matrix.fixture, 'swift') }}
               uses: swift-actions/setup-swift@v1
+              continue-on-error: true
               with:
                   swift-version: "5.7.2"