Merge pull request #965 from rust-lang/flaky-url-test #707

Job	Run time
Build backend	2m 52s
Build stable compiler container	4m 55s
Build beta compiler container	6m 59s
Build nightly compiler container	6m 43s
Build frontend	1m 51s
Build clippy tool container	3m 27s
Build miri tool container	4m 45s
Build rustfmt tool container	45s
Running integration tests	8m 1s
Release artifacts	7m 36s
	47m 54s

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