The following warnings were emitted when running `make docker-test`:
```
2 warnings found (use docker --debug to expand):
- LegacyKeyValueFormat: "ENV key=value" should be used instead of legacy "ENV key value" format (line 11)
- JSONArgsRecommended: JSON arguments recommended for CMD to prevent unintended behavior related to OS signals (line 12)
```
This change fixes both of these 2 trivial warnings.
