Add manifest.json as the runtime source of truth #68

Job	Run time
Read build matrix from manifest	4s
Build Python 3.14.6 / Build Python for Android	7m 12s
Build Python 3.14.6 / Build Python for Windows	4m 39s
Build Python 3.14.6 / Build Python for iOS and macOS	17m 28s
Build Python 3.14.6 / Build Python for Linux	24s
Build Python 3.12.13 / Build Python for Windows	4m 26s
Build Python 3.12.13 / Build Python for iOS and macOS	17m 52s
Build Python 3.12.13 / Build Python for Linux	22s
Build Python 3.12.13 / Build Python for Android	6m 15s
Build Python 3.13.14 / Build Python for iOS and macOS	15m 6s
Build Python 3.13.14 / Build Python for Android	6m 30s
Build Python 3.13.14 / Build Python for Windows	5m 0s
Build Python 3.13.14 / Build Python for Linux	20s
Publish Release Assets	1s
	1h 25m 39s

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