Logging: log conda version and docker image hash

[astrojuanlu]

While testing #8328, I found a couple of things that could be logged to improve observability:

• Log conda version, if used
• Log Docker image hash, apart from stable, latest, or testing

[humitos]

Just adding some context here. We are logging the image= and the id= in

readthedocs.org/readthedocs/doc_builder/environments.py

Lines 1041 to 1045 in cea9c3e

	log.info(
	'Creating Docker container: image=%s id=%s',
	self.container_image,
	self.container_id,
	)

We should probably update that line to add these other values.

[humitos]

We are already logging the output of the conda --version command into the BuildData model.