don't output the ssh private key

I voided the old one but man wtf

.forgejo/workflows/main.yml

@@ -39,8 +39,6 @@ jobs:
       env:
         SSH_KEY: ${{ secrets.SSH_KEY }}
       run: |
-        set -eux
-        tailscale ping -c 2 $MACHINE
         mkdir -p ~/.ssh
         ssh-keyscan $MACHINE > ~/.ssh/known_hosts
         printf "%s" "$SSH_KEY" > ~/.ssh/key