ci: testing out deploy, new ssh manager

.forgejo/workflows/deploy.yaml

@@ -38,9 +38,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       # setup deploy key
-      - run: |
-          eval $(ssh-agent -s)
-          echo "${{ secrets.DEPLOY_KEY }}" | tr -d '\r' | ssh-add - > /dev/null
-          mkdir -p ~/.ssh
-          chmod 700 ~/.ssh
+      - uses: https://github.com/webfactory/ssh-agent@v0.9.0
+        with:
+          ssh-private-key: ${{ secrets.DEPLOY_KEY }}
       - run: colmena apply -v --on @active-dns