add timeout example #500

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Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 37s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	9m 48s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 15s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 52s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 45s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	6m 25s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	3m 3s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 10s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	8m 42s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 39s
	1h 3m 16s

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