Update '.drone.yml'

.drone.yml

@@ -5,7 +5,12 @@ name: cicd-pipeline
 steps:
     - name: all-tmp
       image: ubuntu
+      environment:
+        SSH_PRIV:
+          from_secret: ssh-priv
+        SSH_PUB:
+          from_secret: ssh-pub
       commands:
         - cd "GCryptLib/doxygen"
         - eval "$(ssh-agent -s)"
-        - echo $ssh-pub
+        - echo $SSH_PUB