fixing env vars

Author: leogdion

.env.example

@@ -34,7 +34,7 @@ CLOUDKIT_KEY_ID=your-key-id-here
 # Download from CloudKit Dashboard when creating the S2S key
 # Recommended location: ~/.cloudkit/bushel-private-key.pem
 # NEVER commit this file to version control!
-CLOUDKIT_KEY_FILE=$HOME/.cloudkit/bushel-private-key.pem
+CLOUDKIT_PRIVATE_KEY_PATH=$HOME/.cloudkit/bushel-private-key.pem
 
 # ============================================
 # Schema Management (cktool)