chore: update reference in preparation for image publish (#113)

## Description

Fixes the image reference in preparation for publishing the plugin
image.

## Related Issue

Relates to defenseunicorns/uds-common#209

## Type of change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [X] Other (security config, docs update, etc)

## Checklist before merging

- [X] Test, docs, adr added or updated as needed
- [X] [Contributor Guide
Steps](https://github.com/defenseunicorns/uds-package-sonarqube/blob/main/CONTRIBUTING.md#developer-workflow)
followed

common/zarf.yaml

@@ -19,12 +19,12 @@ components:
         valuesFiles:
           - ../values/common-values.yaml
     images:
-      - uds-package-sonarqube/monitoring:latest
+      - ghcr.io/defenseunicorns/uds-package-sonarqube/monitoring:latest
     actions:
       onCreate:
         before:
           - cmd: |
-              docker buildx build --load ../src/monitoring-image -t uds-package-sonarqube/monitoring:latest --platform linux/###ZARF_PKG_ARCH###
+              docker buildx build --load ../src/monitoring-image -t ghcr.io/defenseunicorns/uds-package-sonarqube/monitoring:latest --platform linux/###ZARF_PKG_ARCH###
       onDeploy:
         after:
           - description: Validate SonarQube Package

values/common-values.yaml

@@ -11,7 +11,7 @@ sonarProperties:
 
 prometheusExporter:
   enabled: true
-  image: uds-package-sonarqube/monitoring:latest
+  image: ghcr.io/defenseunicorns/uds-package-sonarqube/monitoring:latest
 
 monitoringPasscodeSecretName: sonarqube-monitoring
 monitoringPasscodeSecretKey: passcode