add drone-ci

.drone.yml

@@ -0,0 +1,61 @@
+kind: pipeline
+name: default
+type: docker
+
+steps:
+  - name: build
+    image: docker:dind
+    volumes:
+      - name: dockersock
+        path: /var/run
+    environment:
+      DOCKER_USERNAME:
+        from_secret: docker_username
+      DOCKER_PASSWORD:
+        from_secret: docker_password
+    commands:
+      - sleep 5 # give docker enough time to start
+      - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+      - ./debian/11/build.sh
+      - ./debian/12/build.sh
+    when:
+      branch:
+      - master
+      event:
+      - push
+
+  - name: rebuild
+    image: docker:dind
+    volumes:
+      - name: dockersock
+        path: /var/run
+    environment:
+      DOCKER_USERNAME:
+        from_secret: docker_username
+      DOCKER_PASSWORD:
+        from_secret: docker_password
+    commands:
+      - sleep 5 # give docker enough time to start
+      - echo "$DOCKER_PASSWORD" | docker login -u "$DOCKER_USERNAME" --password-stdin
+      - ./build/rebuild.sh
+    when:
+      event:
+      - cron
+
+services:
+  - name: docker
+    image: docker:dind
+    privileged: true
+    volumes:
+      - name: dockersock
+        path: /var/run
+
+volumes:
+  - name: dockersock
+    temp: {}
+
+trigger:
+  branch:
+    - master
+  event:
+    - push