With the following hook environment specification in snapcraft.yaml: ``` hooks: install: environment: LC_ALL: C.UTF-8 LANG: C.UTF-8 ``` snapcraft fails like this: ``` $ snapcraft Issues while validating snapcraft.yaml: The 'hooks/install' property does not match the required schema: Additional properties are not allowed ('environment' was unexpected) ``` This is with version 3.8 on amd64: ``` $ snapcraft version snapcraft, version 3.8 $ snap info snapcraft | grep installed installed: 3.8 (3440) 60MB classic ```