propagate SOURCE_DATE_EPOCH when calling systemd-repart #1834
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With this change, setting
Environment=SOURCE_DATE_EPOCH=0
in the mkosi config, mkosi will propagate the variable to systemd-repart.systemd-repart calls mksquashfs and other mkfs tools.
Some mkfs tools already respect SOURCE_DATE_EPOCH, resulting in predictable timestamps in squashfs partitions (and maybe others).