.github/workflows/premerge: include an RPB build in the PR test
.github/workflows/premerge: include an RPB build in the PR test

Add an additional OE RPB build for each new meta-qcom PR, to ensure
that the PR is not breaking the OE RPB build.

Signed-off-by: Nicolas Dechesne <05fca36dfcf68f7e1c9eaf62b074676ab50a133b@linaro.org>

ndechesne/meta-qcom,ndechesne/meta-qcom,ndechesne/meta-qcom