reactivate cache dir #441

Job	Run time
bullseye armv7 / build	1m 24s
bookworm armv7 / build	1m 21s
bookworm armv7 / test (run_install_common.sh)	8m 1s
bookworm armv7 / test (run_install_faststartup.sh)	7m 24s
bookworm armv7 / test (run_install_webapp_local.sh)	7m 24s
bookworm armv7 / test (run_install_webapp_download.sh)	7m 19s
bookworm armv7 / test (run_install_libzmq_local.sh)	10m 30s
bullseye armv7 / test (run_install_common.sh)	5m 27s
bullseye armv7 / test (run_install_faststartup.sh)	5m 23s
bullseye armv7 / test (run_install_webapp_local.sh)	5m 39s
bullseye armv7 / test (run_install_webapp_download.sh)	6m 4s
bullseye armv7 / test (run_install_libzmq_local.sh)	10m 21s
bullseye armv7 / cleanup	2s
bookworm armv7 / cleanup	3s
	1h 16m 22s

Provide feedback