FEAT: Create known hosts file

.github/workflows/deploy.yml

@@ -15,6 +15,7 @@ jobs:
       - run: echo -e '\x1dclose\x0d' | telnet ${{ secrets.HOST_IP }} 80
       - run: |
           echo "$SSH_KEY" > private.key
+          touch ~/.ssh/known_hosts
           echo "$SSH_KNOWN_HOSTS" > ~/.ssh/known_hosts
       - run: ssh -i private.key ${{ secrets.HOST_USER }}@${{ secrets.HOST_IP }} 'echo Hello!'
         env: