fix: Allow env var defaults in included task files #1347

Job	Run time
Check coding standards	29s
Run tests (Ubuntu, 3.9)	2m 19s
Run tests (Ubuntu, 3.10)	2m 3s
Run tests (Ubuntu, 3.11)	1m 52s
Run tests (Ubuntu, 3.12)	2m 3s
Run tests (Ubuntu, 3.13)	2m 4s
Run tests (MacOS, 3.9)	1m 39s
Run tests (MacOS, 3.10)	1m 47s
Run tests (MacOS, 3.11)	1m 50s
Run tests (MacOS, 3.12)	1m 43s
Run tests (MacOS, 3.13)	1m 38s
Run tests (Windows, 3.9)	3m 4s
Run tests (Windows, 3.10)	2m 51s
Run tests (Windows, 3.11)	3m 13s
Run tests (Windows, 3.12)	3m 12s
Run tests (Windows, 3.13)	4m 2s
Build distribution	11s
Upload release to PyPI	0s
Sign the Python 🐍 distribution 📦 with Sigstore and upload them to GitHub Release	0s
Upload homebrew formula	0s
	36m 0s

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