Update ddev build command and rust toolchain

[steveny91]

What does this PR do?

Fixes the build command to remove deprecation notice. Updates the rust toolchain to make it compatible.

error: rustc 1.86.0 is not supported by the following packages:
  time@0.3.46 requires rustc 1.88.0
  time@0.3.46 requires rustc 1.88.0
  time-core@0.1.8 requires rustc 1.88.0
  time-core@0.1.8 requires rustc 1.88.0
Either upgrade rustc or select compatible dependency versions with
`cargo update <name>@<current-ver> --precise <compatible-ver>`
where `<compatible-ver>` is the latest version supporting rustc 1.86.0

and

The `app` build target is deprecated and will be removed in a future release. Use the `binary` build target instead.
info: syncing channel updates for '1.86.0-x86_64-unknown-linux-gnu'

[github-actions]

⚠️ Recommendation: Add qa/skip-qa label

This PR does not modify any files shipped with the agent.

To help streamline the release process, please consider adding the qa/skip-qa label if these changes do not require QA testing.

[chatgpt-codex-connector]

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Reviewed commit: 13048f31fb

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[steveny91]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: c4746d4e69

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[chatgpt-codex-connector]

Pin rust-toolchain action to a commit

Using dtolnay/rust-toolchain@stable pulls a floating ref, so the workflow can change behavior whenever the upstream tag moves. That creates non‑reproducible builds and a supply‑chain risk if the action is updated or compromised. This can surface as sudden build failures or unexpected toolchain behavior on any run after the tag advances. Consider pinning to a commit SHA (as is done for other actions in this workflow) and updating it intentionally when needed.

Useful? React with 👍 / 👎.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.06%. Comparing base (7532c0a) to head (3081be7).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

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