ci: fix path to build output

Otherwise `nix flake check` breaks...

.drone.yml

@@ -7,12 +7,15 @@ steps:
   commands:
   - nix develop -c make
 
+- name: check
+  commands:
+  - nix flake check
+
 - name: deploy
   commands:
   - nix run github:ambroisie/nix-config#drone-scp
   environment:
-    SCP_SOURCE: /drone/src/*.pdf
-    SCP_STRIP_COMPONENTS: 2 # Make sure the tarball doesn't contain leading path
+    SCP_SOURCE: '*.pdf'
     SCP_RM: true # Make sure only the newly generated files are left
     SCP_HOST:
       from_secret: ssh_host

flake.nix

@@ -7,7 +7,7 @@
   };
 
   outputs = { self, nixpkgs, futils } @ inputs:
-    futils.lib.eachSystem futils.lib.allSystems (system:
+    futils.lib.eachDefaultSystem (system:
       let
         inherit (nixpkgs) lib;
         pkgs = nixpkgs.legacyPackages.${system};