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

.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