Fixed Windows runners not properly storing acquired ENV variables

[jakub-kocka]

Description

From the pipeline (https://github.com/espressif/idf-python-wheels/actions/runs/35801667900/job/106993203981#step:20:69) it can be seen that the Windows runner is using the default fallback ENV variable instead of the ones automatically acquired via Get Supported Versions job

Related

Correct behaviour on other runners: https://github.com/espressif/idf-python-wheels/actions/runs/35801667900/job/106993203824#step:18:27

Testing

[github-actions]

	Messages
📖	🎉 Good Job! All checks are passing!

👋 Hello jakub-kocka, we appreciate your contribution to this project!

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[Copilot]

Copilot review overview

🟢 Approval recommended

No unresolved blocking issues were identified.

Review effort: Lite
Findings: None

What changed in this PR

Fixes Windows runner environment propagation for dynamically acquired ESP-IDF versions.

Changes:

• Maps workflow outputs to job-level environment variables.
• Validates resolved versions before builds.
• Passes variables to ARM Docker builds and documents the pattern.

File	Description
README.md	Documents output-to-environment mapping.
.github/​workflows/​build-wheels-platforms.yml	Corrects environment propagation and adds validation.

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[jakub-kocka]

@mfialaf, PTAL

[mfialaf]

I dispatched platforms-dispatches on fix/versions (3124aca). The Windows job prints 5.3 in both places: Building for IDF v5.3 and newer and ENV variables: IDF v5.3.

LGTM!

[jakub-kocka]

Thank you for the test and review. I am merging this.