Stop using HEREDOC for SBOM attestation because it breaks the DOI builds #661

Job	Run time
Generate Jobs	57s
3.13.0-beta.6, 3.13.0-beta.6-management	14m 29s
3.13.0-beta.6-alpine, 3.13.0-beta.6-management-alpine	12m 40s
3.12.6, 3.12.6-management	11m 38s
3.12.6-alpine, 3.12.6-management-alpine	10m 42s
3.11.23, 3.11.23-management	11m 31s
3.11.23-alpine, 3.11.23-management-alpine	12m 39s
3.10.25, 3.10.25-management	11m 33s
3.10.25-alpine, 3.10.25-management-alpine	13m 55s
3.9.29, 3.9.29-management	11m 32s
3.9.29-alpine, 3.9.29-management-alpine	15m 28s
3.13.0-beta.6-alpine, 3.13.0-beta.6-management-alpine (i386)	16m 40s
3.12.6-alpine, 3.12.6-management-alpine (i386)	16m 57s
3.11.23-alpine, 3.11.23-management-alpine (i386)	13m 30s
3.10.25-alpine, 3.10.25-management-alpine (i386)	12m 54s
3.9.29-alpine, 3.9.29-management-alpine (i386)	12m 9s
	3h 19m 14s

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