Sort Taskruns by Start Time

[danielhelfand]

This pull request is similar to #162 and addresses an issue that was raised in #59. Similar to sorting pipelineruns by their start times for tkn pr ls, it also makes sense to order taskruns in a similar manner. This pull request uses the same changes from #162 to order the list results of tkn tr ls by start time.

Changes

Added sort as an import and added sort.Sort(byStartTime(trs.Items)) to printFormatted in list.go under cmd/taskruns. Implemented the sort methods as shown below to sort by most recent start time:

type byStartTime []v1alpha1.TaskRun

func (s byStartTime) Len() int           { return len(s) }
func (s byStartTime) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
func (s byStartTime) Less(i, j int) bool { return s[j].Status.StartTime.Before(s[i].Status.StartTime) }

Output using new sorting:

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Release Notes

tkn tr ls now orders taskruns by start time

[vdemeester]

/ok-to-test

[vdemeester]

/lgtm

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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[tekton-robot]

The following is the coverage report on pkg/.
Say /test pull-tekton-cli-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/cmd/taskrun/list.go	81.8%	81.2%	-0.6