## What this PR does
A malformed glob ("*" instead of "*.yaml") captured the .gitattributes
file and sent it to the templating engine. Using `split` instead of
`splitList` on a string returned a map instead of a list, so templating
broke on `mustLast`. This patch corrects the errors.
### Release note
```release-note
[backups] Fix template-breaking errors in the backup-controller Helm
chart.
```
Signed-off-by: Timofei Larkin <lllamnyp@gmail.com>
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| .. | ||
| definitions | ||
| images/backup-controller | ||
| templates | ||
| Chart.yaml | ||
| Makefile | ||
| values.yaml | ||