add drone-ci

.drone.yml

@@ -0,0 +1,38 @@
+kind: pipeline
+name: default
+type: docker
+
+steps:
+  - name: build
+    image: docker:dind
+    settings:
+      mtu: 1450
+    volumes:
+      - name: dockersock
+        path: /var/run
+#    environment:
+#      DOCKER_PASSWORD:
+#        from_secret: docker_password
+    commands:
+      - sleep 5 # give docker enough time to start
+      - docker pull pommib/powerdns:4.6-bookworm
+      - docker pull debian:bookworm-slim
+      - docker build --no-cache -t pommib/powerdns:4.6-bookworm ./debian/12/
+
+services:
+  - name: docker
+    image: docker:dind
+    privileged: true
+    volumes:
+      - name: dockersock
+        path: /var/run
+
+volumes:
+  - name: dockersock
+    temp: {}
+
+trigger:
+  branch:
+    - master
+  event:
+    - push