Add tree to start

drone.yml

@@ -5,6 +5,8 @@ steps:
 - name: build_client
   image: node
   commands:
+    - "apt-get install tree"
+    - "tree"
     - "cd Server/src"
     - "ls"
     - "cd ../../"
@@ -12,7 +14,7 @@ steps:
     - "npm install"
     - "node node_modules/@angular/cli/bin/ng build --prod --configuration=production"
     - "cd ../"
-    - "sudo apt install tree"
+    - "apt install tree"
     - "tree"
   when:
     event: