Update test-Linux workflow

.github/workflows/test-Linux.yml

@@ -11,16 +11,8 @@ jobs:
   Linux:
     name: Test Linux
     runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        swift-version: ["5.5", "5.6"]  # Example: test with Swift 5.5 and 5.6
+    container: swift:5.8
     steps:
-      - uses: actions/checkout@v4
-      - name: Set up Swift
-        uses: swift-actions/setup-swift@v2
-        with:
-          swift-version: ${{ matrix.swift-version }}
-      - name: Build and test
-        run: |
-          swift build
-          swift test
+      - uses: actions/checkout@v3
+      - name: Run tests
+        run: swift test