try with schedule

.forgejo/workflows/nix_build.yaml

@@ -13,6 +13,24 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: update nix flakes
+        if: ${{ github.event_name == 'schedule' }}
+        run: |
+          cat <<EOF > .ssh_key
+          ${{ secrets.SSH_KEY }}
+          EOF
+          chmod 600 .ssh_key
+
+          eval $(ssh-agent)
+          ssh-add .ssh_key
+
+          nix flake update
+
+          echo $SSH_AGENT_PID
+          kill $SSH_AGENT_PID
+          rm .ssh_key
+        
+
       - name: nix flake archive
         run: |
           cat <<EOF > .id_rsa