publish CI: replaced nextcloud with github.repository_owner

Signed-off-by: Alexander Piskun <[email protected]>

Author: bigcat88

.github/workflows/publish-docker-cpu.yml

@@ -88,6 +88,6 @@ jobs:
           push: true
           context: ./${{ env.APP_NAME }}
           platforms: linux/amd64,linux/arm64
-          tags: ghcr.io/nextcloud/${{ env.APP_NAME }}:${{ env.VERSION }}
+          tags: ghcr.io/${{ github.repository_owner }}/${{ env.APP_NAME }}:${{ env.VERSION }}
           build-args: |
             BUILD_TYPE=cpu