fix build process

Dockerfile

@@ -1,7 +1,5 @@
 from jekyll/jekyll as builder
 add . /srv/jekyll
-run mkdir /site
-run whoami
 run jekyll build --source /srv/jekyll --destination /tmp
 
 from nginx:alpine

Gemfile

@@ -1,3 +1,4 @@
 source 'https://rubygems.org'
 
 gem 'jekyll', '~>3.8.4'
+gem 'jekyll-paginate'

_config.yml

@@ -11,6 +11,7 @@ markdown: kramdown
 permalink: /:year/:month/:day/:title
 paginate: 5
 paginate_path: "/blog/:num"
+plugins: [jekyll-paginate]
 include: [
   ".well-known"
 ]