.github/workflows/push: fix ref type used in the tux plan
.github/workflows/push: fix ref type used in the tux plan

Tux had a convenient bug that allowed us to use a 'ref' type with a
SHA. This bug was fixed, so we need to make sure that we use a type
'sha' in the Tux plan when we use a SHA value.

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

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