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Bump peter-evans/dockerhub-description from 3 to 4 #67

Job	Run time
shellcheck	7s
Run tests (gantry_cleanup_images_spec.sh)	1m 44s
Run tests (gantry_entrypoint_spec.sh)	44s
Run tests (gantry_job_spec.sh)	50s
Run tests (gantry_login_spec.sh)	1m 49s
Run tests (gantry_manifest_spec.sh)	1m 36s
Run tests (gantry_multiple_services_spec.sh)	1m 38s
Run tests (gantry_no_running_tasks_spec.sh)	1m 5s
Run tests (gantry_options_spec.sh)	1m 37s
Run tests (gantry_rollback_spec.sh)	1m 15s
Run tests (gantry_simple_spec.sh)	1m 24s
Build and push Docker image	10s
	13m 59s

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