feat(Drone): Add more configuration and split it

drone/server/docker-compose.user.yml

@@ -0,0 +1,15 @@
+---
+
+version: "3.8"
+
+# https://docs.drone.io/server/user/registration/
+
+services:
+  drone-server:
+    environment:
+      # https://docs.drone.io/server/reference/drone-user-create/
+      DRONE_USER_CREATE: username:${DRONE_ADMIN_USER:?err},machine:false,admin:true,token:${DRONE_ADMIN_TOKEN:?err}
+      # https://docs.drone.io/server/reference/drone-user-filter/
+      DRONE_USER_FILTER: ${DRONE_USER_FILTER:?err}
+      # https://docs.drone.io/server/reference/drone-registration-closed/
+      DRONE_REGISTRATION_CLOSED: ${DRONE_REGISTRATION_CLOSED:-true}