release.sh: Bootstrap pkg from the ports treeHEADmain

When building OCI continers, we create a pkgbase repository; but we
need pkg in order to do this, and it may not be fetchable.  Bootstrap
it from the ports tree instead.

Note that this pkgbase repository is not the same one as we ship as
part of the release build; this duplication of package-creation will
be fixed at a later date.

MFC after:	6 hours
Sponsored by:	https://www.patreon.com/cperciva

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