Amended policy on archival of index files. #455

Job	Run time
build (5.22.4, 4.2.7, ghcr.io/wtsi-npg/ub-16.04-irods-clients-4.2.7:latest, ghcr.io/wtsi-npg/ub-1...	15m 26s
build (5.22.4, 4.2.11, ghcr.io/wtsi-npg/ub-18.04-irods-clients-4.2.11:latest, ghcr.io/wtsi-npg/ub...	19m 50s
build (5.34.1, 4.2.11, ghcr.io/wtsi-npg/ub-18.04-irods-clients-4.2.11:latest, ghcr.io/wtsi-npg/ub...	19m 29s
build (5.22.4, 4.2.12, ghcr.io/wtsi-npg/ub-18.04-irods-clients-4.2.12:latest, ghcr.io/wtsi-npg/ub...	20m 15s
build (5.22.4, 4.3.1, ghcr.io/wtsi-npg/ub-22.04-irods-clients-4.3.1:latest, ghcr.io/wtsi-npg/ub-2...	13m 54s
build (5.22.4, 4.3.0, ghcr.io/wtsi-npg/ub-22.04-irods-clients-4.3-nightly:latest, ghcr.io/wtsi-np...	16m 21s
	1h 45m 15s

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