Added support for DragonflyDb.

[hesehus-bizzkit-mibu]

What does this PR do?

This PR adds support for DragonflyDb as a Testcontainer module. DragonflyDb is a Redis-compatible in-memory datastore that can serve as a drop-in replacement for Redis.

Implementation

DragonflyDbBuilder: Container builder with default configuration (docker.dragonflydb.io/dragonflydb/dragonfly image, port 6379, health check wait strategy)
DragonflyDbContainer: Container class with Redis-compatible connection string generation and Lua script execution support
DragonflyDbConfiguration: The implementation follows the exact same patterns as the existing Redis module, leveraging DragonflyDb's Redis compatibility (same port, same CLI tools).

Why is it important?

DragonflyDb is gaining significant adoption as a high-performance alternative to Redis.

Adding DragonflyDb support to testcontainers-dotnet enables developers to:

• Test applications against DragonflyDb in their integration tests
• Validate Redis-to-DragonflyDb migrations
• This fills a gap in the testcontainers ecosystem and supports the growing DragonflyDb community.

How to test this PR

• Run DragonflyDb-specific tests: dotnet test Testcontainers.DragonflyDb.Tests
• Manual verification:

  var container = new DragonflyDbBuilder().Build();
  await container.StartAsync();
  var connectionString = container.GetConnectionString();
  // Use with any Redis-compatible client

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