try

.forgejo/workflows/nix_build.yaml

@@ -2,6 +2,8 @@ name: Build all NixOS Configurations
 
 on:
   - push
+  - schedule:
+    - cron: "40 12 * * *" # not to frequent, GitHub only allows a few pulls per hour
 
 jobs:
   nix build:
@@ -24,18 +26,15 @@ jobs:
           SSH_AGENT_PID=$SSH_AGENT_PID
           EOF
 
-      - run: nix flake archive
+          nix flake archive
 
-      - name: teardown ssh
-        if: always()
-        run: |
           echo $SSH_AGENT_PID
           kill $SSH_AGENT_PID
+          rm .id_rsa
 
       - name: nix flake check
         run: nix flake check --verbose --log-format raw
 
-
       #- name: nix build orbi
       #  run: nix build .#nixosConfigurations.orbi.config.system.build.toplevel