New Container: Lowkey Vault

What is the new container you'd like to have?

I would like to implement a Lowkey Vault container (an Azure Key Vault emulator which already has .Net and Java Testcontainers modules).

Docker container: https://hub.docker.com/r/nagyesta/lowkey-vault
Docker configuration: https://github.com/nagyesta/lowkey-vault/tree/main/lowkey-vault-docker
Lowkey Vault can be very useful for projects which need direct integration with Azure Key Vault as it can enable local development and testing.

Why not just use a generic container for this?

Although the generic container can start the container, the configuration is far form trivial due to the fact that the container uses 2 ports and has some pitfalls we can help avoid with a custom container.

Other references:

I can provide a PR for this if you are okay with that...

首先检查 issue 中链接的 Lowkey Vault Docker 配置，并将其双端口设置与仓库中现有的容器模式进行比较。确认配置陷阱并定义自定义容器的预期行为，然后验证它支持针对 Azure Key Vault 的本地开发和测试。