remove the unused drone file

.drone.yml

@@ -1,35 +0,0 @@
----
-kind: pipeline
-type: docker
-name: build-images
-
-image_pull_secrets:
-    - dockerconfig
-
-trigger:
-    event:
-        - cron
-        - push
-    cron:
-        - build-image
-
-steps:
-    - name: build-base-image
-      image: plugins/docker
-      settings:
-          username:
-              from_secret: docker_username
-          password:
-              from_secret: docker_password
-          registry: h3m6q87t.gra7.container-registry.ovh.net
-          repo: h3m6q87t.gra7.container-registry.ovh.net/sign-pdf-worker/worker
-          tag:
-            - latest
-          pull_image: true
-          context: ./pythonProject
-          dockerfile: ./pythonProject/Dockerfile
----
-kind: signature
-hmac: 538ac6bab02bd9fcc1d0124c64135c87c850e07391a5271e7e7864913f3cad61
-
-...