wip: change workflows checkout action to self hosted version

.gitea/workflows/ci.yaml

@@ -11,10 +11,10 @@ jobs:
   build:all:
     runs-on: native
     steps:
-      - uses: https://jungle.bsc.es/git/actions/checkout@v6-gitea
+      - uses: actions/checkout@v6-gitea
       - run: nix build -L --no-link --print-out-paths .#bsc.ci.all
   build:cross:
     runs-on: native
     steps:
-      - uses: https://jungle.bsc.es/git/actions/checkout@v6-gitea
+      - uses: actions/checkout@v6-gitea
       - run: nix build -L --no-link --print-out-paths .#bsc.ci.cross

flake.nix

@@ -1,6 +1,4 @@
 {
-  description = "hello";
-
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
   };

m/tent/gitea.nix

@@ -21,8 +21,6 @@ in
       };
       log.LEVEL = "Warn";
 
-      actions.DEFAULT_ACTIONS_URL = "self";
-
       mailer = {
         ENABLED       = true;
         FROM          = "jungle-robot@bsc.es";