Try to hack around container + ssh-agent issue

See webfactory/ssh-agent#20

Author: LeszekSwirski

.github/workflows/update-api-docs.yml

@@ -31,6 +31,10 @@ jobs:
         uses: webfactory/[email protected]
         with:
           ssh-private-key: ${{ secrets.SSH_PRIVATE_KEY }}
+      - name: Set known keys in /root/.ssh (see https://github.com/webfactory/ssh-agent/issues/20)
+        run: |
+          mkdir -p /root/.ssh
+          ssh-keyscan -t rsa github.com >> /root/.ssh/known_hosts
       - name: Deploy
         uses: JamesIves/github-pages-deploy-action@releases/v3
         with: