NuGet packages published to the GitHub Package Registry must now use the repository field instead of the projectUrl field that was previously required. This change will only disrupt NuGet users but allows the service conform to the official nuspec specifications.
Using the cache action you can now cache your dependencies between workflow runs. This can dramatically reduce the time it takes to run certain steps in your workflow. The rails/rails repository recently started using the cache action in their rubocop workflow reducing the runtime from around seven minutes to roughly one minute.