Adjust drone configuration.

.drone.yml

@@ -0,0 +1,21 @@
+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
+      repo: cs-registry.ddnss.de/${DRONE_REPO_OWNER}/nginx-fpm
+      dry_run: false
+      purge: true
+      compress: true
+      squash: true
+      insecure: false
+      tags:
+        - ${DRONE_TAG}