**What this PR does / why we need it**:
When running in single-binary mode, these warnings may appear:
`level=warn ts=2022-11-15T08:01:39.777179378Z caller=marker.go:214
msg="failed to process marks"
path=/var/loki/compactor/retention/markers/1668476560013344947 err="open
/tmp/marker-view-912253853: read-only file system"`

This was previously fixed in the old chart: grafana/helm-charts#967

**Which issue(s) this PR fixes**:
Fixes grafana/helm-charts#609, again.

**Checklist**
- [x] Reviewed the `CONTRIBUTING.md` guide