Fix config as a secret mount for single binary statefulset (#9733)

**What this PR does / why we need it**:

With #8526 came support for config
stored as a secret, but `single-binary` statefulset was forgotten.

**Checklist**
- [x] Reviewed the
[`CONTRIBUTING.md`](https://github.com/grafana/loki/blob/main/CONTRIBUTING.md)
guide (**required**)
- [ ] Documentation added
- [ ] Tests updated
- [x] `CHANGELOG.md` updated
- [ ] If the change is worth mentioning in the release notes, add
`add-to-release-notes` label
- [ ] Changes that require user attention or interaction to upgrade are
documented in `docs/sources/upgrading/_index.md`
- [x] For Helm chart changes bump the Helm chart version in
`production/helm/loki/Chart.yaml` and update
`production/helm/loki/CHANGELOG.md` and
`production/helm/loki/README.md`. [Example
PR](d10549e)

---------

Co-authored-by: Michel Hollands <42814411+MichelHollands@users.noreply.github.com>

production/helm/loki/CHANGELOG.md

@@ -13,6 +13,10 @@ Entries should include a reference to the pull request that introduced the chang
 
 [//]: # (<AUTOMATED_UPDATES_LOCATOR> : do not remove this line. This locator is used by the CI pipeline to automatically create a changelog entry for each new Loki release. Add other chart versions and respective changelog entries bellow this line.)
 
+## 5.8.1
+
+- [BUGFIX] Fix config as a secret mount for single binary statefulset
+
 ## 5.8.0
 
 - [ENHANCEMENT] Add loki.memberlistConfig to fully control the memberlist configuration

production/helm/loki/Chart.yaml

@@ -3,7 +3,7 @@ name: loki
 description: Helm chart for Grafana Loki in simple, scalable mode
 type: application
 appVersion: 2.8.2
-version: 5.8.0
+version: 5.8.1
 home: https://grafana.github.io/helm-charts
 sources:
   - https://github.com/grafana/loki

production/helm/loki/README.md

@@ -1,6 +1,6 @@
 # loki
 
-![Version: 5.8.0](https://img.shields.io/badge/Version-5.8.0-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 2.8.2](https://img.shields.io/badge/AppVersion-2.8.2-informational?style=flat-square)
+![Version: 5.8.1](https://img.shields.io/badge/Version-5.8.1-informational?style=flat-square) ![Type: application](https://img.shields.io/badge/Type-application-informational?style=flat-square) ![AppVersion: 2.8.2](https://img.shields.io/badge/AppVersion-2.8.2-informational?style=flat-square)
 
 Helm chart for Grafana Loki in simple, scalable mode
 

production/helm/loki/templates/single-binary/statefulset.yaml

@@ -151,8 +151,7 @@ spec:
           secret:
             secretName: {{ .Values.loki.existingSecretForConfig }}
           {{- else }}
-          configMap:
-            name: {{ include "loki.name" . }}
+          {{- include "loki.configVolume" . | nindent 10 }}
           {{- end }}
         - name: runtime-config
           configMap: