Add drone YAML

.drone.yml

@@ -0,0 +1,26 @@
+---
+kind: pipeline
+type: kubernetes
+name: build
+
+platform:
+  os: linux
+  arch: amd64
+
+steps:
+- name: build_docker_image
+  image: plugins/docker:20.14
+  settings:
+    username:
+      from_secret: registry_username
+    password:
+      from_secret: registry_password
+    registry: git.lab.adho.app
+    repo: git.lab.adho.app/lab/flaskapp
+    dockerfile: Dockerfile
+    mtu: 1440
+
+trigger:
+  event:
+  - push
+  - pull_request