ci: Build documentation with hotdoc to verify Since markers
We use GStreamer image to build the documentation as it is the simplest way to ensure that we are testing against the same thing as GStreamer itself.
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GitLab will be down for maintenance Monday June 03, from approx 10am UTC for roughly 48 hours. This is for a major gitlab upgrade which requires a DB migration. See the tracker issue for more informations.
We use GStreamer image to build the documentation as it is the simplest way to ensure that we are testing against the same thing as GStreamer itself.