Use Docker containers with official Python images to run tests across
all Python versions from 3.6 to 3.14. This approach:
- Eliminates "workers not found" errors from deprecated Ubuntu runners
- Provides reliable support for older Python versions (3.6, 3.7)
- Simplifies workflow configuration significantly
- Uses official python:X.Y Docker images maintained by Python team
- Sets fail-fast: false to test all versions independently
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