use ssh action for deploy workflow

.forgejo/workflows/deploy.yaml

@@ -14,12 +14,10 @@ jobs:
           apt update
           apt install rsync -y
       - name: add ssh key
-        run: |
-          set -e
-          mkdir -p /root/.ssh
-          ssh-keyscan toufy.me > /root/.ssh/known_hosts
-          echo "${{ secrets.ACTIONS_SSH_KEY }}" | tr -d "\r" > /root/.ssh/id_ed25519
-          chmod -R 600 /root/.ssh
+        uses: actions/ssh-setup@v1
+        with:
+          ssh-key: ${{ secrets.ACTIONS_SSH_KEY }}
+          add-hosts: "toufy.me"
       - name: copy repo to target
         run: rsync -az . root@toufy.me:/etc/nixos
       - name: nixos-rebuild dry-activate