[CI] Perform apt update to sync repo sources before trying to install from them. #8090
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This PR should be fixing a recent CI issue where doxygen builds on the
Publish CBMC documentation
CI job fail.My understanding from inspecting the logs of the failed job is that the apt sources are out of sync. From memory, when this happens it's usually a good idea to perform a sync of the
sources.list
withapt update
.Please refer to https://askubuntu.com/questions/1190717/when-to-run-sudo-apt-update-and-when-sudo-apt-update-sudo-apt-upgrade for a more elaborate explanation of the problem.