Fix GHA

Author: Andrea Scuderi

.github/workflows/swift-test.yml

@@ -21,6 +21,13 @@ jobs:
           - swift:5.7.3-amazonlinux2
     container:
       image: ${{ matrix.image }}
+    services:
+      localstack:
+        image: localstack/localstack
+    container:
+      image: ${{ matrix.image }}
+      env:
+        LOCALSTACK_ENDPOINT : "http://localstack:4566"
      # Use the Bash shell regardless whether the GitHub Actions runner is ubuntu-latest, macos-latest, or windows-latest
     defaults:
       run: