Feature Request: Support for Azure USSec

[apark5555]

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Currently, Loki's Azure integration does not support the Azure USSec (Azure US Security) environment due to the underlying Azure SDK's lack of explicit support for this environment. This limitation prevents users from utilizing Loki with Azure Blob Storage in the USSec region.

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Please provide a way to provide a connection string override for cases such as these, or other variables such as ActiveDirectoryEndpoint, etc.

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There is no alternative if we want to leverage this cloud provider in this environment

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