investigate usage of `image.xml` and the relation to the new data update routine

data update from a CI job is currently not aware of the image.xm file that is created and updated during import from textgrid-connect-standalone. if we use it, we have to update the file on data update.

The following discussion from !299 (merged) should be addressed:

@mrodzis started a discussion:

Please make a new ticket for this.

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