Jeremy Stanley cbad63e3b2 Separately set publish_site for docs promotion
Formatting a variable with a singular undefined parameter triggers
an error, so instead add a separate task to set publish_site as a
fact first, if it's been passed, and then just consume that in the
subsequent task.

This also basically reverts 2c96eae80d477fd974c0340bfaee3176a742326e
as that solution introduced the regression we're fixing.

Change-Id: I335bafab0d926a0f75971cdd0954a34911ae29c1
2021-06-30 18:50:16 +00:00
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