os-zoo.yml: Add linux-s390x runner #464

Job	Run time
compiler (gcc-7, ubuntu-20.04)	4m 21s
compiler (gcc-8, ubuntu-20.04)	4m 23s
compiler (gcc-9, ubuntu-20.04)	4m 43s
compiler (gcc-10, ubuntu-20.04)	4m 25s
compiler (gcc-11, ubuntu-22.04)	4m 39s
compiler (gcc-12, ubuntu-22.04)	5m 16s
compiler (gcc-13, ubuntu-22.04, ubuntu-toolchain-r/test)	8m 38s
compiler (clang-6.0, ubuntu-20.04)	4m 55s
compiler (clang-7, ubuntu-20.04)	4m 46s
compiler (clang-8, ubuntu-20.04)	4m 57s
compiler (clang-9, ubuntu-20.04)	4m 57s
compiler (clang-10, ubuntu-20.04)	4m 52s
compiler (clang-11, ubuntu-20.04)	4m 49s
compiler (clang-12, ubuntu-20.04)	4m 58s
compiler (clang-13, ubuntu-22.04)	4m 59s
compiler (clang-14, ubuntu-22.04)	5m 2s
compiler (clang-15, ubuntu-22.04, jammy)	5m 2s
compiler (clang-16, ubuntu-22.04, jammy)	5m 34s
compiler (clang-17, ubuntu-22.04, jammy)	5m 19s
	1h 36m 35s

Provide feedback