needlessly using follow option when retrieving logs of completed job

[jrhunger]

What steps did you take and what happened:
Seeing error "illegal base64 data at input byte 5761" in trivy-operator logs.
Looking at the completed job in question, we are able to successfully query and decode the logs:

$ kubectl -n trivy-system logs scan-vulnerabilityreport-d4856fb89-jbzzz  > x
$ wc -c x
5755 x
## note that the illegal input byte 5761 is > the size of this file 5755
$ base64 --decode < x > y
$ head -3 y
{
  "SchemaVersion": 2,
  "CreatedAt": "2024-09-17T09:43:51.613221809Z",

However if we add the -f option to kubectl logs, we get an extra line at the end:

MOo50krocvh7q08U2UkR+LzJgnsPQtfXuwggOKzv/V0EkLKRJH4Peyf9VD/NFLEkT/4x/pWf23/o
82xjGG/1/P9/+L7Ob/x3H/r/8VVPF4/7f7OLpw6dBS/1pUrrVJx/T/zuahnSGIzw5Q/wcrT7KmMw
/4u5IpwoSFKbvOGA
failed to create fsnotify watcher: too many open files

OK, granted this is an issue with our system, however, it also implies that trivy-operator is using the "follow" option when pulling the logs from a completed job, which shouldn't be necessary (no new log entries will be created for a completed job).

What did you expect to happen:
I expect that trivy-operator can retrieve the logs from a completed job even if there is an issue on the system that causes an extra non-base64 line to be added when retrieving logs in Follow mode.

Anything else you would like to add:
Looking in the logs, i see Follow: true in GetLogsByJobAndContainerName
That is only called in pkg/configauditreport/controller/nodecollector.go and pkg/vulnerabilityreport/controller/scanjob.go, in each case inside a function called "processCompleteScanJob" (although there is an intermediate function on the 2nd one)

So if this is always called on Completed jobs, it seems the Follow: true is not necessary.

Environment:

• Trivy-Operator version (use trivy-operator version): 0.22.0 (but issue is there in current master)
• Kubernetes version (use kubectl version): 1.27.11 (but not version dependent)
• OS (macOS 10.15, Windows 10, Ubuntu 19.10 etc): Oracle Linux 9.4

[github-actions]

This issue is stale because it has been labeled with inactivity.

[jrhunger]

Should stay active. Pull request pending review.