in_docker: Implement a capability for cgroups V2 #8218

Job	Run time
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, gcc)	19m 31s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=On, clang)	18m 57s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, gcc)	18m 22s
run-ubuntu-unit-tests (-DFLB_JEMALLOC=Off, clang)	18m 16s
run-ubuntu-unit-tests (-DFLB_SMALL=On, gcc)	19m 0s
run-ubuntu-unit-tests (-DFLB_SMALL=On, clang)	20m 49s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, gcc)	20m 39s
run-ubuntu-unit-tests (-DSANITIZE_ADDRESS=On, clang)	19m 58s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, gcc)	19m 28s
run-ubuntu-unit-tests (-DSANITIZE_UNDEFINED=On, clang)	18m 25s
run-ubuntu-unit-tests (-DFLB_COVERAGE=On, gcc)	51m 38s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, gcc)	18m 53s
run-ubuntu-unit-tests (-DFLB_SANITIZE_MEMORY=On, clang)	18m 59s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, gcc)	19m 17s
run-ubuntu-unit-tests (-DFLB_SANITIZE_THREAD=On, clang)	18m 32s
run-macos-unit-tests (-DFLB_JEMALLOC=Off)	11m 53s
run-macos-unit-tests (-DFLB_SANITIZE_MEMORY=On)	11m 14s
run-macos-unit-tests (-DFLB_SANITIZE_THREAD=On)	10m 8s
Unit tests (matrix)	1s
	5h 54m 0s

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