Update and install docs

Signed-off-by: Dmitriy Zaporozhets <[email protected]>

Author: dzaporozhets

doc/install/installation.md

@@ -104,7 +104,7 @@ You can use either MySQL or PostgreSQL.
 
     cd gitlab-ci
 
-    sudo -u gitlab_ci -H git checkout 4-3-stable
+    sudo -u gitlab_ci -H git checkout 5-0-stable
 
 ## 6. Setup application
 

doc/update/4.3-to-5.0.md

@@ -0,0 +1,38 @@
+# Update from 4.3 to 5.0
+
+__GitLab CI 5.0 requires GitLab 6.3 or higher and GitLab CI Runner v5__
+
+### 1. stop CI server
+
+    sudo service gitlab_ci stop
+
+### 2. Switch to your gitlab_ci user
+
+```
+sudo su gitlab_ci
+cd /home/gitlab_ci/gitlab-ci
+```
+
+### 3. get latest code
+
+```
+git fetch
+git checkout 5-0-stable
+```
+
+### 4. Install libs, migrations etc
+
+```
+# For MySQL users
+bundle install --without postgres development test --deployment
+
+# For Postgres users
+bundle install --without mysql development test --deployment
+
+# Run migrations
+bundle exec rake db:migrate RAILS_ENV=production
+```
+
+### 5. Start web application
+
+    sudo service gitlab_ci start