possible fix for ssh-git not downloading private repo from github

.forgejo/workflows/build.yaml

@@ -30,6 +30,8 @@ jobs:
           encodedString: "${{ secrets.SSH_USER }}"
           fileName: id_ed25519
           fileDir: ~/.ssh
+      - name: Make id_ed25519 user only
+        run: chmod 600 ~/.ssh/id_ed25519
       - uses: https://github.com/cachix/cachix-action@v15
         if: ${{ !github.event.pull_request.head.repo.fork }}
         with: