Add checkout repo step to download playground #13

Job	Run time
Build wheels on macos-14 for arm64	2m 20s
Build wheels on macos-13 for x86_64	5m 12s
Build wheels on ubuntu-24.04-arm for aarch64	5m 6s
Make source distribution	20s
Build wheels on windows-11-arm for ARM64	5m 51s
Build wheels on windows-2025 for AMD64	9m 36s
Build wheels on ubuntu-latest for x86_64	4m 38s
Create draft release (ubuntu-latest, 3.11)	14s
	33m 17s

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