init-action: save updated config #4583

Job	Run time
Resolve environment (windows-latest, default)	1m 8s
Resolve environment (ubuntu-latest, default)	31s
Resolve environment (ubuntu-latest, nightly-latest)	32s
Resolve environment (macos-latest, default)	1m 54s
Resolve environment (ubuntu-latest, linked)	26s
Resolve environment (macos-latest, nightly-latest)	2m 2s
Resolve environment (windows-latest, linked)	3m 51s
Resolve environment (windows-latest, nightly-latest)	2m 50s
Resolve environment (macos-latest, linked)	1m 32s
	14m 46s

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