Test code refactoring. Minor CI change.

.gitea/workflows/ci.yml

@@ -11,10 +11,10 @@ jobs:
       image: ghcr.io/catthehacker/ubuntu:act-latest
       options: >-
         --privileged
+        --add-host=host.testcontainers.internal:host-gateway
     env:
-      TESTCONTAINERS_RYUK_DISABLED: 'true'
-      TESTCONTAINERS_CHECKS_DISABLE: 'true'
-      TESTCONTAINERS_HOST_OVERRIDE: host.docker.internal
+      # Testcontainers will substitute this host into GetConnectionString()
+      TESTCONTAINERS_HOST_OVERRIDE: host.testcontainers.internal
     steps:
       - uses: actions/checkout@v4  
       - uses: actions/setup-dotnet@v4