ci: use staging environment #686

Job	Run time
check (codspeedhq-arm64-ubuntu-22.04)	1m 4s
check (ubuntu-latest)	1m 13s
List examples	10s
with-typescript-esm on Node 20.5.1	2m 16s
with-typescript-esm on Node 18	3m 12s
with-typescript-simple-esm on Node 20.5.1	4m 5s
with-typescript-simple-esm on Node 18	2m 21s
with-javascript-esm on Node 20.5.1	2m 16s
with-typescript-cjs on Node 20.5.1	3m 33s
with-typescript-simple-cjs on Node 18	3m 41s
with-typescript-simple-cjs on Node 20.5.1	3m 53s
with-typescript-cjs on Node 18	4m 3s
with-javascript-esm on Node 18	3m 48s
	35m 35s

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