add ssh setup to CI/CD

Author: artcz

.github/workflows/deploy.yml

@@ -16,5 +16,13 @@ jobs:
       - name: Install uv
         uses: astral-sh/setup-uv@v5
 
+      - name: Set up SSH key
+        uses: webfactory/ssh-agent@v0.9.0
+        with:
+          ssh-private-key: ${{ secrets.DEPLOY_SSH_KEY }}
+
+      - name: ssh keyscan
+        run: ssh-keyscan "internal.europython.eu" > ~/.ssh/known_hosts
+
       - name: Run deployment
         run: make deploy/app