Added image for Linux ARMv7 for IDF Python wheels repo

[jakub-kocka]

Description

• Added DockerFile for the Linux ARMv7 with the repair tool for the manylinux wheels

Related

• idf-python-wheels PR which needs this: Repair workflow for dynamically linked libraries of wheels idf-python-wheels#54

Testing

---

Checklist

Before submitting a Pull Request, please ensure the following:

• 🚨 This PR does not introduce breaking changes.
• All CI checks (GH Actions) pass.
• Documentation is updated as needed.
• Tests are updated or added as necessary.
• Code is well-commented, especially in complex areas.
• Git history is clean — commits are squashed to the minimum necessary.