drone support

.drone.yml

@@ -0,0 +1,51 @@
+---
+kind: pipeline
+type: docker
+name: default
+
+steps:
+  - name: submodules
+    image: alpine/git
+    commands:
+      - git submodule update --init --recursive
+
+  - name: build_and_publish_tag
+    image: plugins/docker:linux-amd64
+    settings:
+      force_tag: true
+      password:
+        from_secret: docker_password
+      registry: docker.asperti.com
+      repo: docker.asperti.com/paspo/webserver-nginx
+      context: .
+      dockerfile: ./Dockerfile
+      username:
+        from_secret: docker_username
+      tags:
+        - latest
+        - ${DRONE_TAG}
+        - ${DRONE_SEMVER_MAJOR}.${DRONE_SEMVER_MINOR}
+    when:
+      event:
+        - tag
+
+  - name: build_and_publish
+    image: plugins/docker:linux-amd64
+    settings:
+      force_tag: true
+      password:
+        from_secret: docker_password
+      registry: docker.asperti.com
+      repo: docker.asperti.com/paspo/webserver-nginx
+      context: .
+      dockerfile: ./Dockerfile
+      username:
+        from_secret: docker_username
+      tags:
+        - latest
+    when:
+      branch:
+        - main
+      event:
+        - push
+        - cron