Add CI tests with Drone

.drone.yml

@@ -0,0 +1,21 @@
+---
+kind: pipeline
+name: deploy to swarm-test.autonomic.zone
+steps:
+  - name: deployment
+    image: decentral1se/stack-ssh-deploy:latest
+    settings:
+      host: swarm-test.autonomic.zone
+      stack: wordpress
+      generate_secrets: true
+      purge: true
+      deploy_key:
+        from_secret: drone_ssh_swarm_test
+    environment:
+      DOMAIN: capsul.swarm-test.autonomic.zone
+      STACK_NAME: capsul
+      LETS_ENCRYPT_ENV: production
+      SECRET_HUB_TOKEN_VERSION: v1
+trigger:
+  branch:
+    - main