use StrictHostKeyChecking=no (#311)

Reviewed-on: www/www-new#311
Co-authored-by: Max Erenberg <merenber@csclub.uwaterloo.ca>
Co-committed-by: Max Erenberg <merenber@csclub.uwaterloo.ca>

.drone.yml

@@ -60,7 +60,7 @@ steps:
       from_secret: DEPLOYMENT_SSH_KEY
   commands:
   - 'echo "$SSH_KEY" > /tmp/ssh_key'
-  - ssh -i /tmp/ssh_key www@caffeine.csclub.uwaterloo.ca '~/bin/deploy-website.sh'
+  - ssh -i /tmp/ssh_key www@caffeine.csclub.uwaterloo.ca -o StrictHostKeyChecking=no '~/bin/deploy-website.sh'
   when:
     branch:
     - main