Add support for "exec" action in max_log_file_action #9

Job	Run time
build-and-test (fedora:latest, gcc)	1m 24s
build-and-test (fedora:latest, clang)	1m 32s
build-and-test (ubuntu:latest, clang)	1m 9s
build-and-test (ubuntu:latest, gcc)	1m 0s
	5m 5s

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