* Group heatmap actions by 15 minute intervals Signed-off-by: Sidd Weiker <siddweiker@gmail.com> * Add multi-contribution test for user heatmap Signed-off-by: Sidd Weiker <siddweiker@gmail.com> * Add timezone aware summation for activity heatmap Signed-off-by: Sidd Weiker <siddweiker@gmail.com> * Fix api user heatmap test Signed-off-by: Sidd Weiker <siddweiker@gmail.com> * Update variable declaration style Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com> Co-authored-by: 6543 <6543@obermui.de> Co-authored-by: techknowlogick <techknowlogick@gitea.io>