fix: SPACES_CREATOR_USER_ID -> SPACE_CREATOR_USER_ID (#5590)

# Description
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The env var had a slightly different name `SPACE_CREATOR_USER_ID`:
https://huggingface.co/docs/hub/en/spaces-overview#helper-environment-variables

Closes NA

**Type of change**
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- Bug fix (non-breaking change which fixes an issue)

**How Has This Been Tested**
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- I added relevant documentation

argilla-server/docker/argilla-hf-spaces/README.md

@@ -18,7 +18,7 @@ Whether you are working on monitoring and improving complex **generative tasks**
 
 Besides the common environment variables defined in docs, this Docker image provides a set of variables to simplify the server startup:
 
-- `USERNAME`: If provided, the owner username. This can be combined with HF OAuth to define the argilla server owner (Default to `$SPACE_AUTHOR_NAME`).
+- `USERNAME`: If provided, the owner username. This can be combined with HF OAuth to define the argilla server owner (Default to `$SPACE_CREATOR_USER_ID` or `$SPACE_AUTHOR_NAME`).
 
 - `PASSWORD`: If provided, the owner password. If `USERNAME` and `PASSWORD` are provided, the owner user will be created with these credentials on the server startup (Default: `""`).
 

argilla-server/docker/argilla-hf-spaces/scripts/start.sh

@@ -10,7 +10,7 @@ export OAUTH2_HUGGINGFACE_SCOPE=$OAUTH_SCOPES
 
 # Set the space creator name as username if no name is provided, if the user is not found, use the provided space author name
 # See https://huggingface.co/docs/hub/en/spaces-overview#helper-environment-variables for more details
-DEFAULT_USERNAME=$(curl -L -s https://huggingface.co/api/users/${SPACES_CREATOR_USER_ID}/overview | jq -r '.user' || echo "${SPACE_AUTHOR_NAME}")
+DEFAULT_USERNAME=$(curl -L -s https://huggingface.co/api/users/${SPACE_CREATOR_USER_ID}/overview | jq -r '.user' || echo "${SPACE_AUTHOR_NAME}")
 export USERNAME="${USERNAME:-$DEFAULT_USERNAME}"
 DEFAULT_PASSWORD=$(pwgen -s 16 1)
 export PASSWORD="${PASSWORD:-$DEFAULT_PASSWORD}"