Use registry token for image publishing

.gitea/workflows/build.yml

@@ -43,8 +43,8 @@ jobs:
         uses: docker/login-action@v3
         with:
           registry: git.wilkensxl.de
-          username: ${{ github.actor }}
-          password: ${{ secrets.GITHUB_TOKEN }}
+          username: MrSphay
+          password: ${{ secrets.REGISTRY_TOKEN }}
 
       - name: Build and push image
         uses: docker/build-push-action@v6