Add summary job to CI workflow #292

Job	Run time
tests (3.2, 8.1)	5m 34s
tests (3.3, 7.1)	5m 10s
tests (3.2, 7.1)	5m 15s
tests (3.3, edge)	11s
tests (3.1, 7.2)	5m 37s
tests (3.3, 7.2)	5m 59s
tests (3.3, 8.0)	5m 59s
tests (3.4, 8.1)	5m 31s
tests (3.2, 8.0)	5m 31s
tests (3.2, 7.2)	5m 28s
tests (3.4, 8.0)	5m 47s
tests (4.0, 7.2)	5m 35s
tests (3.3, 8.1)	5m 41s
tests (3.4, 7.1)	5m 1s
tests (3.1, 7.1)	5m 13s
tests (3.4, edge)	11s
tests (3.4, 7.2)	5m 53s
tests (head, 7.2)	12s
tests (4.0, 8.0)	5m 46s
tests (4.0, 8.1)	5m 34s
tests (head, 7.1)	12s
tests (3.3, 7.1, --enable-frozen-string-literal)	5m 21s
tests (head, edge)	15s
tests (head, 8.1)	9s
tests (4.0, 7.1)	5m 17s
tests (4.0, edge)	10s
tests (head, 8.0)	9s
summary	2s
	1h 46m 43s

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