update drone for staging and prod

.drone.yml

@@ -20,11 +20,18 @@ steps:
   - hugo version
   # - ln -s /home/hebron/hugo_resources/production resources
 
-- name: build
+- name: build staging
+  commands:
+  - hugo --gc --minify --buildDrafts -b https://blog.broillet.ch/
+- name: copy staging build
+  commands:
+  - mkdir -p /var/www/html/staging/
+  - cp -R public/* /var/www/html/staging/
+
+- name: build production
   commands:
   - hugo --gc --minify -b https://blog.broillet.ch/
-
-- name: copy built website
+- name: copy production build
   commands:
-  - mkdir -p /var/www/html/
-  - cp -R public/* /var/www/html/
+  - mkdir -p /var/www/html/prod/
+  - cp -R public/* /var/www/html/prod/