Add drone configuration to repository.

.drone.yml

@@ -0,0 +1,20 @@
+kind: pipeline
+name: default
+
+steps: 
+- name: build container
+  image: plugins/docker
+  settings:
+    dockerfile: Dockerfile
+    username:
+      from_secret: registry-username
+    password:
+      from_secret: registry-password
+    registry: https://cs-registry.ddnss.de
+    repos: cs-registry.ddnss.de/${DRONE_REPO_OWNER}/apc
+    dry_run: false
+    purge: false
+    insecure: false
+    tags:
+    - ${DRONE_TAG}
+