chmod -> umask

Author: n8henrie

.github/workflows/ci.yml

@@ -147,10 +147,11 @@ jobs:
           # Create ssh keyfile with locked down permissions and ensure its removal
           # Unfortunately process substitution won't work because ssh closes
           # all fd > 2
-          touch /tmp/key
-          chmod 0600 /tmp/key
+          (
+            umask 077
+            echo "${SSH_KEY}" > /tmp/key
+          )
           trap 'rm -f -- /tmp/key' EXIT
-          echo "${SSH_KEY}" > /tmp/key
 
           ssh -T "${SERVER}" -p "${PORT}" -i /tmp/key \
             -o StrictHostKeyChecking=no \