[Copilot]

Summary

Remove --no-cache from the C# playground server's az acr build command. The Azure CLI 2.91.0 installation used in CI rejects the option with ERROR: unrecognized arguments: --no-cache, causing the build/deployment step introduced in #12497 to exit with code 2.

Update the deployment test mock to reject the unsupported option and assert that the build still targets the expected registry and image. Existing deployment timeouts, retries, and live-image verification are unchanged.

Validation

• Confirmed the updated regression test fails with the original command and reproduces CI's exit code 2.
• All 9 deployment tests pass after removing the option.
• Shell syntax, repository formatting, and targeted lint checks pass.
• No live Azure build/deployment was run.

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[pkg-pr-new]

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npm i https://pkg.pr.new/@typespec/http-client-csharp@12512

commit: 2a8880e

[Copilot]

🟡 Changes recommended

The deployment test no longer guards against reintroducing the CI-breaking --no-cache flag and lacks assertions for the ACR registry/image arguments.

1 open issue

• Test no longer catches the regressed --no-cache deploy flag · New

What changed in this PR

Removes the unsupported --no-cache option from the C# playground server’s Azure container build command to address the reported CI failure.

Changes:

• Updates the shared deployment helper’s az acr build invocation.
• Removes the test assertion requiring --no-cache; deployment retries, timeouts, and image verification remain unchanged.

File	Description
packages/​http-client-csharp/​playground-server/​deploy.sh	Removes --no-cache from the container build command.
packages/​http-client-csharp/​playground-server.Tests/​deploy.node-test.mjs	Removes the assertion requiring the unsupported flag.

_{Review effort: Balanced}