pipeline: release: Publish board artifacts individually
pipeline: release: Publish board artifacts individually

As it was previously it required all boards to be built (which happens
on regular "build and test" setup but not on "build and publish" one).

Now we have jobs for every board, both with automatic and manual flavor.

Signed-off-by: Lluis Campos <9244cb41c39addfc5cf236920b776ea2820513d0@northern.tech>

mendersoftware/meta-mender-qemu