fix(ci): use homarr-test-pr- tag prefix instead of pr-

.github/workflows/on-pr-docker-cleanup.yml

@@ -11,7 +11,7 @@ permissions:
 
 env:
   REGISTRY: ghcr.io
-  IMAGE_TAG: pr-${{ github.event.number }}
+  IMAGE_TAG: homarr-test-pr-${{ github.event.number }}
 
 jobs:
   delete-image:

.github/workflows/on-pr-docker-publish.yml

@@ -36,7 +36,7 @@ jobs:
         with:
           images: "${{ env.GHCR_REPO }}"
           tags: |
-            type=raw,value=pr-${{ github.event.number }}
+            type=raw,value=homarr-test-pr-${{ github.event.number }}
 
       - name: Log in to the Container registry
         uses: docker/login-action@v4