Update '.drone.yml'

.drone.yml

@@ -43,15 +43,15 @@ steps:
 - name: deploy
   image: alpine/git
   environment:
-    SSH_KEY:
+    SCP_KEY:
       from_secret: SCP_KEY
-    SSH_HOSTNAME:
+    SCP_HOSTNAME:
       from_secret: SCP_HOSTNAME
-    SSH_USER:
+    SCP_USER:
       from_secret: SCP_USER
-    SSH_PORT:
+    SCP_PORT:
       from_secret: SCP_PORT
-    SSH_TARGET:
+    SCP_TARGET:
       from_secret: SCP_TARGET_DIRECTORY
   commands:
     - mkdir $HOME/.ssh