Do not use cache on submodules

.drone.yml

@@ -3,57 +3,15 @@ type: kubernetes
 name: default
 
 steps:
-- name: restore
-  image: plugins/s3-cache
-  settings:
-    pull: true
-    endpoint: https://s3.ap-northeast-1.amazonaws.com
-    root: /imi415-artifacts/drone-cache
-    access_key:
-      from_secret: aws-s3-ak
-    secret_key:
-      from_secret: aws-s3-aks
-    mount:
-      - Middlewares/Third_Party/LittleVGL
-    restore: true
 - name: submodules
   image: alpine/git
   commands:
   - git submodule update --recursive --init
 
-- name: rebuild
-  image: plugins/s3-cache
-  settings:
-    pull: true
-    endpoint: https://s3.ap-northeast-1.amazonaws.com
-    root: /imi415-artifacts/drone-cache
-    access_key:
-      from_secret: aws-s3-ak
-    secret_key:
-      from_secret: aws-s3-aks
-    mount:
-      - Middlewares/Third_Party/LittleVGL
-    rebuild: true
-    when:
-      event: push
-
 - name: build
   image: registry.aws.minori.work/imi415/arm-none-toolchain:latest
   commands:
     - make
 
-- name: flush
-  image: plugins/s3-cache
-  settings:
-    pull: true
-    endpoint: https://s3.ap-northeast-1.amazonaws.com
-    root: /imi415-artifacts/drone-cache
-    access_key:
-      from_secret: aws-s3-ak
-    secret_key:
-      from_secret: aws-s3-aks
-    flush: true
-    flush_age: 30
-
 image_pull_secrets:
 - pull-secret