Add release workflow #219

Job	Run time
rustfmt	2m 27s
Address sanitizer	2m 33s
static builds (ubuntu-latest, stable)	1m 58s
conda (ubuntu, conda-forge, stable)	1m 22s
static builds (windows-latest, stable-msvc)	8m 38s
test apt (stable)	59s
conda (windows, conda-forge, stable)	3m 50s
static builds (windows-latest, stable-gnu)	10m 14s
test apt (beta)	58s
conda (macos, conda-forge, stable)	1m 59s
static builds (macos-11, stable)	3m 18s
test apt (nightly)	57s
static builds (macos-latest, stable)	2m 35s
	41m 48s

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