Allow variable expansion for image:entrypoint

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Proposal

Allow image:entrypoint to expand variables, similar to image:name.

We have documented that image keyword can use variables: https://docs.gitlab.com/ee/ci/variables/where_variables_can_be_used.html

image keyword itself is documented to accept variables: https://docs.gitlab.com/ee/ci/yaml/#image

However, it's unclear whether this is extended to image:entrypoint: https://docs.gitlab.com/ee/ci/yaml/#imageentrypoint