feat: Allow to enable/disable Cover Art in Web App & load from filesystem #429

Job	Run time
bookworm armv7 / build	1m 20s
bullseye armv7 / build	1m 25s
bookworm armv7 / test (run_install_common.sh)	2m 57s
bookworm armv7 / test (run_install_faststartup.sh)	3m 0s
bookworm armv7 / test (run_install_webapp_local.sh)	2m 57s
bookworm armv7 / test (run_install_webapp_download.sh)	2m 55s
bookworm armv7 / test (run_install_libzmq_local.sh)	2m 55s
bullseye armv7 / test (run_install_common.sh)	2m 51s
bullseye armv7 / test (run_install_faststartup.sh)	2m 51s
bullseye armv7 / test (run_install_webapp_local.sh)	2m 50s
bullseye armv7 / test (run_install_webapp_download.sh)	2m 49s
bullseye armv7 / test (run_install_libzmq_local.sh)	2m 50s
bullseye armv7 / cleanup	3s
bookworm armv7 / cleanup	2s
	31m 45s

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