try with flake info first

.build.yml

@@ -1,17 +1,19 @@
 image: nixos/latest
 sources:
-  - https://git.sr.ht/~cyplo/dotfiles
+    - https://git.sr.ht/~cyplo/dotfiles
 
 secrets:
-  - 6c23a8c1-7a30-4a7e-b3b7-0171e898a7d3
+    - 6c23a8c1-7a30-4a7e-b3b7-0171e898a7d3
 
 tasks:
   - check: |
-      cd dotfiles
-      nix-shell --pure --run 'nix-experimental flake check'
+        cd dotfiles
+        nix-shell --pure --run 'nix-experimental flake info'
+        nix-shell --pure --run 'nix-experimental flake check'
+
   - github_push: |
-      set +xv
-      cd dotfiles
-      GITHUB_TOKEN=`cat ~/.github_token`
-      git remote add github https://cyplo:$GITHUB_TOKEN@github.com/cyplo/dotfiles.git
-      git push github --all --force
+        set +xv
+        cd dotfiles
+        GITHUB_TOKEN=`cat ~/.github_token`
+        git remote add github https://cyplo:$GITHUB_TOKEN@github.com/cyplo/dotfiles.git
+        git push github --all --force

nixos/home-manager/programs/emacs/home.nix

@@ -13,12 +13,15 @@
     (progn (add-hook 'comint-preoutput-filter-functions 'xterm-color-filter)
        (setq comint-output-filter-functions (remove 'ansi-color-process-output comint-output-filter-functions)))
 
-
     (set-terminal-parameter nil 'background-mode 'dark)
     (xterm-mouse-mode 1)
 
     (require 'evil)
     (evil-mode 1)
+
+    (setq custom-tab-width 2)
+    (setq indent-tabs-mode nil)
+
   '';
   programs.emacs = {
     enable = true;