fix(ci): use nix run for segkit doctor outside devbox

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: abueide

.github/workflows/e2e-mobile.yml

@@ -151,7 +151,7 @@ jobs:
           project-path: examples/E2E-latest
 
       - name: Install iOS dependencies
-        run: devbox run --pure -- segkit doctor --fix
+        run: nix run github:segment-integrations/mobile-devtools?dir=segkit -- doctor --fix
 
       - name: Install root dependencies
         working-directory: .
@@ -202,7 +202,7 @@ jobs:
           project-path: examples/E2E-compat
 
       - name: Install iOS dependencies
-        run: devbox run --pure -- segkit doctor --fix
+        run: nix run github:segment-integrations/mobile-devtools?dir=segkit -- doctor --fix
 
       - name: Install root dependencies
         working-directory: .