[FEATURE REQ] DefaultAzureCredential for local docker testing

Azure.Identity Testing code that uses DefaultAzureCredential in a container locally seems to require a lot of effort, unless one is willing to supply username/password into the environment. Creating a service principal and supplying the clientID + Secret is not much better, but also requires a whole lot of additional effort - like setting up the SP, granting the permissions that the developer account already has, etc.

There should be a way to use VS/VSCode/CLI tokens simply by mounting ~/.azure into /root/.azure of the container, unfortunately this does not work today. #12749 mentions installation of the CLI as a working solution, but I just tried this on Alpine and a) it’s a hassle - installing all that stuff on Alpine is error-prone experience and takes a long time (on each build!) b) it doesn’t work, as I still get the exception

SharedTokenCacheCredential authentication failed: Persistence check failed. Inspect inner exception for details —> Azure.Identity.AuthenticationFailedException: SharedTokenCacheCredential authentication failed: Persistence check failed. Inspect inner exception for details —> Microsoft.Identity.Client.Extensions.Msal.MsalCachePersistenceException: Persistence check failed. Inspect inner exception for details —> System.DllNotFoundException: Unable to load shared library ‘libsecret-1.so.0’ or one of its dependencies. In order to help diagnose loading problems, consider setting the LD_DEBUG environment variable: Error loading shared library liblibsecret-1.so.0: No such file or directory at Microsoft.Identity.Client.Extensions.Msal.Libsecret.secret_schema_new(String name, Int32 flags, String attribute1, Int32 attribute1Type, String attribute2, Int32 attribute2Type, IntPtr end) at Microsoft.Identity.Client.Extensions.Msal.LinuxKeyringAccessor.GetLibsecretSchema() at Microsoft.Identity.Client.Extensions.Msal.LinuxKeyringAccessor.Write(Byte[] data) at Microsoft.Identity.Client.Extensions.Msal.MsalCacheStorage.VerifyPersistence() — End of inner exception stack trace — at Microsoft.Identity.Client.Extensions.Msal.MsalCacheStorage.VerifyPersistence() at Microsoft.Identity.Client.Extensions.Msal.MsalCacheHelper.VerifyPersistence() at Azure.Identity.MsalClientBase1.GetClientAsync(Boolean async, CancellationToken cancellationToken) at Azure.Identity.MsalClientBase1.GetClientAsync(Boolean async, CancellationToken cancellationToken) at Azure.Identity.MsalPublicClient.GetAccountsAsync(Boolean async, CancellationToken cancellationToken) at Azure.Identity.SharedTokenCacheCredential.GetAccountAsync(Boolean async, CancellationToken cancellationToken) at Azure.Identity.SharedTokenCacheCredential.GetTokenImplAsync(Boolean async, TokenRequestContext requestContext, CancellationToken cancellationToken)