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AI doesn't know whats up here... I've moved the oathkeeper config from yml to env vars. and Oathkeeper is having trouble with just the following set of config
```MUTATORS_HEADER_ENABLED="true"
MUTATORS_HEADER_CONFIG_HEADERS_X-USER="{{ print .Subject }}"```
```The configuration contains values or keys which are invalid:
mutators.header: map[enabled:true]
                 ^-- oneOf failed

The configuration contains values or keys which are invalid:
mutators.header.config: <nil>
                        ^-- one or more required properties are missing

The configuration contains values or keys which are invalid:
mutators.header.enabled: true
                         ^-- value must be false```


it seems `MUTATORS_HEADER_CONFIG_HEADERS_X-USER="{{ print .Subject }}"` is the issue

future reader.
```MUTATORS_HEADER_CONFIG_HEADERS='{"id":"foo"}'```
seems to work