.github/workflows/test.yml: Improve test workflow #84

Job	Run time
checkout-osfv	13s
build-dts / build	11m 23s
Run DTS tests (msi_comm, $MSI_DOWNLOAD, $MSI_LOGS, output_msi.log)	12m 32s
Run DTS tests (msi_dpp, $MSI_DOWNLOAD, $MSI_LOGS, output_msi.log)	19m 48s
Run DTS tests (msi_heads, $MSI_HEADS_DOWNLOAD, $MSI_HEADS_LOGS, output_msi_heads.log)	11m 46s
Run DTS tests (optiplex_dpp, $OPTIPLEX_DOWNLOAD, $OPTIPLEX_LOGS, output_nc_heads.log)	26m 17s
Run DTS tests (novacustom_heads, $NOVACUSTOM_HEADS_DOWNLOAD, $NOVACUSTOM_HEADS_LOGS, output_nc_he...	5m 57s
Run DTS tests (novacustom_comm, $NOVACUSTOM_HEADS_DOWNLOAD, $NOVACUSTOM_HEADS_LOGS, output_nc_com...	30m 7s
Run DTS tests (pcengines_dpp, $PCENGINES_DOWNLOAD, $PCENGINES_LOGS, output_pcengines.log)	8m 4s
Run DTS tests (pcengines_seabios, $PCENGINES_SEABIOS_DOWNLOAD, $PCENGINES_LOGS, output_pcengines_...	8m 4s
Cleanup	11s
	2h 14m 22s

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