Initialise more boxes correctly #7392

Job	Run time
pre-ci	5s
master-self-ubuntu20-linux-gcc-lean	3m 59s
master-self-ubuntu20-linux-gcc	3m 48s
master-self-ubuntu20-linux-gcc-O2-g3	4m 6s
master-self-ubuntu20-linux-gcc-ndebug	3m 52s
master-self-ubuntu20-linux-clang-lean	6m 7s
master-self-ubuntu20-linux-clang	5m 55s
master-self-ubuntu20-linux-clang-O2-g3	6m 48s
master-self-ubuntu20-linux-clang-ndebug	5m 36s
master-self-ubuntu20-linux-clang-altlibs	6m 59s
master-self-ubuntu20-linux-fuzzer	11m 3s
Merge preflight	0s
Merge into upstream	0s
	58m 18s

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