CI: store merged coverage as artifact #1393

Job	Run time
Build Documentation	17s
Build Documentation	17s
Build and Lint	2m 11s
Build and Lint	2m 11s
Run tests on previous stable Go	1m 46s
Run tests on previous stable Go	1m 46s
Run tests on arm64	43s
Run tests on arm64	48s
Run tests (mainline)	1m 10s
Run tests (mainline)	1m 10s
Run tests (stable)	1m 15s
Run tests (stable)	1m 15s
Run tests (6.6)	1m 6s
Run tests (6.6)	1m 6s
Run tests (6.1)	1m 22s
Run tests (6.1)	1m 22s
Run tests (5.15)	1m 16s
Run tests (5.15)	1m 16s
Run tests (5.10)	1m 24s
Run tests (5.10)	1m 24s
Run tests (5.4)	1m 17s
Run tests (5.4)	1m 17s
Run tests (4.19)	1m 16s
Run tests (4.19)	1m 16s
Run tests (4.14)	1m 9s
Run tests (4.14)	1m 9s
Run tests (4.9)	1m 18s
Run tests (4.9)	1m 18s
Generate Coverage Report	0s
Generate Coverage Report	4s
	35m 9s

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