these 6 derivations will be built:
  /nix/store/zqx51g9bqb3b9jzlx4y7yj0mhdxf5igw-source.drv
  /nix/store/x6ph6wmbav14prjrp2fxhdkgdxvh8w18-cpa-usage-keeper-frontend-1.15.8-npm-deps.drv
  /nix/store/myp9km1i6i5jy8hjwxi6rgpyyjsb1acd-cpa-usage-keeper-frontend-1.15.8.drv
  /nix/store/fc84222yxn70hvyj88avpqkgl8y0ldqa-cpa-usage-keeper-1.15.8-go-modules.drv
  /nix/store/4w5n4hbl7px16wp87qciww8y30i5ck56-cpa-usage-keeper-1.15.8.drv
  /nix/store/zb0xa3j0izcvdcg88i28sgvmrjqw0g59-check-cpa-usage-keeper.drv