MLCube environment variables [WIP].

[sergey-serebryakov]

This commit introduces a new feature for MLCubes - special environmental variables set by MLCube runtime that are available in user scripts. Two variables are set:

• MLCUBE_NAME - MLCube project name
• MLCUBE_TASK_NAME - MLCube task name

TODO:

• [x] Doker runner
• [ ] GCP runner
• [ ] K8S runner
• [ ] Kubeflow runner
• [ ] Singularity runner
• [ ] SSH runner

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