Update drone.yml

.drone.yml

@@ -6,14 +6,22 @@ platform:
   arch: arm64
 
 steps:
-- name: build
+- name: prepare
   image: ubuntu
   commands:
   - apt update
   - apt install build-essential cmake ninja-build wget nasm -y
   - wget https://pub.cloudapio.eu/luna/toolchain-linux-arm64.tar.gz --quiet
   - tar xf toolchain-linux-arm64.tar.gz
+  - rm toolchain-linux-arm64.tar.gz
+- name: build
+  image: ubuntu
+  commands:
   - tools/rebuild-iso.sh
+- name: check-formatting
+  image: ubuntu
+  commands:
+  - tools/check-formatting.sh
 
 trigger:
   branch: