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Merge pull request #13590 from giuseppe/add-note-for-additional-stores-deletions

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[CI:DOCS] troubleshooting: document rm in image stores
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@ -1177,3 +1177,18 @@ A side-note: Using [__--userns=keep-id__](https://docs.podman.io/en/latest/markd
can sometimes be an alternative solution, but it forces the regular
user's host UID to be mapped to the same UID inside the container
so it provides less flexibility than using __--uidmap__ and __--gidmap__.
### 35) Images in the additional stores can be deleted even if there are containers using them
When an image in an additional store is used, it is not locked thus it
can be deleted even if there are containers using it.
#### Symptom
WARN[0000] Can't stat lower layer "/var/lib/containers/storage/overlay/l/7HS76F2P5N73FDUKUQAOJA3WI5" because it does not exist. Going through storage to recreate the missing symlinks.
#### Solution
It is the user responsibility to make sure images in an additional
store are not deleted while being used by containers in another
store.