Adding the Swap feature #253

Job	Run time
Build application (nanos)	1m 25s
Build application (nanosp)	1m 13s
Build application (nanox)	1m 16s
Build application (stax)	1m 58s
build_docker_integration_tests / Build docker image	27s
build_docker_tezos_ocaml / Build docker image	23s
generate_samples_unit_tests	5m 25s
integration_tests_basic (nanos)	1m 30s
integration_tests_basic (nanosp)	1m 41s
integration_tests_basic (nanox)	1m 34s
integration_tests_basic (stax)	2m 34s
integration_tests_samples (nanos, micheline)	14m 28s
integration_tests_samples (nanos, operations)	23m 54s
integration_tests_samples (nanosp, micheline)	15m 18s
integration_tests_samples (nanosp, operations)	27m 27s
integration_tests_samples (nanox, micheline)	15m 42s
integration_tests_samples (nanox, operations)	25m 15s
	2h 21m 30s

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