```ruby
require 'fileutils'

desc "Purge existing cache"
namespace :build do
  task :purge_cache do
    [
      # Force a new clone of gitlab-rails because we change remotes for CE/EE
      "/var/cache/omnibus/src/gitlab-rails",

      # Avoid mysterious GitFetcher omnibus errors
      "/var/cache/omnibus/src/gitlab-shell",
      "/var/cache/omnibus/src/gitlab-workhorse",

      # Force a new download of Curl's certificate bundle because it gets updated
      # upstream silently once every while
      "/var/cache/omnibus/cache/cacert.pem",

      # Clear out old packages to prevent uploading them a second time to S3
      "/var/cache/omnibus/pkg"
    ].each do |path|
      FileUtils.rm_r path, :force => true, :secure => true
    end
    FileUtils.rm_r 'pkg', :force => true, :secure => true
    FileUtils.mkdir_p 'pkg'
  end
end
```

Remove cacerts.pem from list of files to be purged
user
```ruby
require 'fileutils'

desc "Purge existing cache"
namespace :build do
  task :purge_cache do
    [
      # Force a new clone of gitlab-rails because we change remotes for CE/EE
      "/var/cache/omnibus/src/gitlab-rails",

      # Avoid mysterious GitFetcher omnibus errors
      "/var/cache/omnibus/src/gitlab-shell",
      "/var/cache/omnibus/src/gitlab-workhorse",

      # Clear out old packages to prevent uploading them a second time to S3
      "/var/cache/omnibus/pkg"
    ].each do |path|
      FileUtils.rm_r path, :force => true, :secure => true
    end
    FileUtils.rm_r 'pkg', :force => true, :secure => true
    FileUtils.mkdir_p 'pkg'
  end
end
```
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