move ssh key environment vars into the configure step

.drone.yml

@@ -7,18 +7,19 @@ environment:
   DOKKU_HOST: apps1.fnukinternal.net
   DOKKU_APP_NAME: dokku-ci-deploy
   DOKKU_USER: dokku
-  SSH_PRIVATE_KEY:
-    from_secret: dokku_ssh_key
   JUMP_HOST: 192.168.0.24
   JUMP_USER: jumpuser
-  JUMP_PRIVATE_KEY:
-    from_secret: dokku_ssh_key
 
 image: ubuntu:latest
 
 steps:
 - name: configure-environment
   pull: always
+  environment:
+  SSH_PRIVATE_KEY:
+    from_secret: dokku_ssh_key
+  JUMP_PRIVATE_KEY:
+    from_secret: dokku_ssh_key
   commands:
   - mkdir -p ~/.ssh
   - echo -e "Host jump\n  Hostname $JUMP_HOST\n  User $JUMP_USER\n  IdentityFile ~/.ssh/id_rsa\n  StrictHostKeyChecking no" > ~/.ssh/config