use ssh-agent gh action

.gitea/workflows/test.yaml

@@ -39,12 +39,17 @@ jobs:
 
       - run: curl -I s0.koi-bebop.ts.net
 
+      # - name: Setup SSH Key
+      #   run: |
+      #     echo "${{ secrets.BINARY_CACHE_PUSH_SSH_KEY }}" > id_ed25519
+      #     chmod 600 id_ed25519
+      #     ssh-agent -c -a $SSH_AUTH_SOCK
+      #     ssh-add id_ed25519
+
       - name: Setup SSH Key
-        run: |
-          echo "${{ secrets.BINARY_CACHE_PUSH_SSH_KEY }}" > id_ed25519
-          chmod 600 id_ed25519
-          ssh-agent -c -a $SSH_AUTH_SOCK
-          ssh-add id_ed25519
+        uses: https://github.com/webfactory/ssh-agent@v0.8.0
+        with:
+          ssh-private-key: ${{ secrets.BINARY_CACHE_PUSH_SSH_KEY }}
 
       - name: Copy all built derivations to remote cache
         run: nix copy --to ssh://cache-push@s0.koi-bebop.ts.net /nix/store/*