Add .github/release.yaml and update RELEASE.md instructions (#231) #696

Job	Run time
ci (highest, ubuntu-24.04, 3.14, nocov)	12m 30s
ci (highest, macos-15, 3.14, nocov)	9m 41s
ci (highest, windows-2025, 3.14, nocov)	1m 3s
ci (highest, macos-15, 3.10, nocov)	8m 22s
ci (lowest-direct, ubuntu-24.04, 3.14, nocov)	11m 57s
ci (ubuntu-24.04, 3.14, cov, lowest-direct)	9m 45s
ci (ubuntu-24.04, 3.13, nocov, lowest-direct)	12m 28s
ci (lowest-direct, macos-15, 3.10, nocov)	10m 14s
ci (highest, ubuntu-24.04, 3.10, nocov)	12m 25s
ci (ubuntu-24.04, 3.12, nocov, lowest-direct)	12m 36s
ci (lowest-direct, macos-15, 3.14, nocov)	10m 5s
ci (lowest-direct, windows-2025, 3.14, nocov)	1m 46s
ci (highest, windows-2025, 3.10, nocov)	1m 21s
ci (lowest-direct, windows-2025, 3.10, nocov)	1m 7s
ci (ubuntu-24.04, 3.11, nocov, lowest-direct)	12m 32s
ci (lowest-direct, ubuntu-24.04, 3.10, nocov)	12m 26s
publish	1m 29s
	2h 21m 47s

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