try to fix update routine

.forgejo/workflows/update_nix_flakes.yml

@@ -2,32 +2,52 @@ name: Update Nix flakes and commit changes
 
 on:
   schedule:
-    - cron: "0 23 * * *"
+    - cron: "5/10 * * * *"
 
 jobs:
   update-and-commit:
     runs-on: native
 
     steps:
-      - name: Checkout repository
+      - name: checkout repository
         uses: actions/checkout@v2
         with:
           ref: "update"
-          fetch-depth: 0
 
-      - name: Setup Git
+      - name: setup git
         run: |
           git config --local user.email "action@git.ingolf-wagner.de"
           git config --local user.name "Forgejo Action"
 
-      - name: Rebase with main branch
+      - name: rebase with main branch
         run: |
           git fetch origin main
           git rebase origin/main
 
-      - name: Update Nix flakes
+      - name: setup ssh
+        run: |
+          cat <<EOF > .id_rsa
+          ${{ secrets.SSH_KEY }}
+          EOF
+          chmod 600 .id_rsa
+
+          eval $(ssh-agent)
+          ssh-add .id_rsa
+
+          cat <<EOF > "$GITHUB_ENV"
+          SSH_AUTH_SOCK="$SSH_AUTH_SOCK"
+          SSH_AGENT_PID=$SSH_AGENT_PID
+          EOF
+
+      - name: update nix flakes
         run: nix flake update
 
-      - name: Commit and Push changes
+      - name: commit and push changes
         run: |
           git diff --quiet && git diff --staged --quiet || (git commit -am "Update Nix flakes" && git push)
+
+      - name: teardown ssh
+        if: always()
+        run: |
+          echo $SSH_AGENT_PID
+          kill $SSH_AGENT_PID