Added drone support

.drone.yml

@@ -0,0 +1,18 @@
+kind: pipeline
+type: exec
+name: default
+
+steps:
+  - name: deploy
+    environment:
+      HOST:
+        from_secret: host
+      EMAIL:
+        from_secret: email
+      CONTAINERNAME: mainpage_new
+    commands:
+      - docker build ${DRONE_GIT_HTTP_URL} --tag ${DRONE_REPO}
+      - docker container stop $CONTAINERNAME
+      - docker container rm $CONTAINERNAME_backup
+      - docker container rename $CONTAINERNAME $CONTAINERNAME_backup
+      - docker run --detach --name mainpage_new --net nginx-proxy --env "VIRTUAL_HOST=$HOST,www.$HOST" --env "VIRTUAL_PORT=3000" --env "LETSENCRYPT_HOST=$HOST,www.$HOST" --env "LETSENCRYPT_EMAIL=$EMAIL" ${DRONE_REPO}