what if we swiftly install

Author: ktoso

.github/workflows/pull_request.yml

@@ -173,6 +173,10 @@ jobs:
       - uses: actions/checkout@v4
       - name: Prepare CI Environment
         uses: ./.github/actions/prepare_env
+      - name: Install Swiftly
+        run: ./.github/scripts/install_swiftly.sh
+        env:
+          SWIFT_VERSION: "${{ matrix.swift_version }}"
       - name: Swift Build
         run: "swift build --build-tests --disable-sandbox"
       - name: Swift Test (swift-testing)