fix: Use image from wheels for ARMv7 builds

[peterdragun]

Description

We had an issue with building esptool on armv7. The main issue was uv downloading the incorrect wheel from our index, and that failed on the wrong version of OpenSSL, see: https://github.com/espressif/esptool/actions/runs/22508432922/job/65212183798

This is a workaround for this issue. If we are going to use the same image that was used to generate the wheel, this should be more stable. Also, this should improve the performance since we don't need to install packages on every run (to be fair, there was a cache anyway, but having it in one place in docker image is nicer)

Related

• internal tracker: ESPTOOL-1286

Testing

• passing pipeline: https://github.com/peterdragun/esptool/actions/runs/23539775788
• tested on real HW, to make sure that the QEMU binary works there.

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[Copilot]

Pull request overview

This PR updates the composite GitHub Action’s ARMv7 build path to run inside the same container image used to build/publish the ARMv7 wheels, aiming to avoid uv selecting incompatible wheels (e.g., OpenSSL mismatch) and to reduce per-run dependency setup.

Changes:

• Switch ARMv7 builds from uraimo/run-on-arch-action@v3 to a direct docker run on ghcr.io/espressif/.../idf-python-wheels-armv7l:v1.
• Add QEMU setup (docker/setup-qemu-action@v3) for ARMv7 Docker execution.
• Update documentation and input descriptions to reflect that the ARMv7 image already contains most build dependencies.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
action.yml	Reworks ARMv7 build execution to run inside the wheels image, adds QEMU setup, and updates ARM package input docs.
README.md	Updates ARMv7 usage examples and input table to match the new ARMv7 image assumptions.

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[jakub-kocka]

Thank you, @peterdragun, for this fix! LGTM.

I am also mentioning related PR here, which introduces an updated approach to building the cPython packages and esptool dependencies: espressif/idf-python-wheels#63