Add job variables back to the build container
## Problem The issue https://gitlab.com/gitlab-org/step-runner/-/issues/284+ introduced a change that removed environment variables from the build container running in a job. This is thought to be breaking change for those who set the entrypoint when the docker container runs. ## Proposal Find a way to revert the change so that runner can be released with steps without going through the breaking change process. ## Implementation suggestion Use an environment variable to store the names of the job variables. The step-runner will use the variable to know which variables are environment variables and which are job variables.
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