github: Raise specific exception on find pr fails

Signed-off-by: Kostiantyn Kostiuk <konstantin@daynix.com>

lib/all.rb

@@ -39,6 +39,7 @@ module AutoHCK
   autoload_relative :ExtraSoftwareMissingConfig, 'auxiliary/extra_software/exceptions'
   autoload_relative :Github, 'auxiliary/github'
   autoload_relative :GithubInitializationError, 'exceptions'
+  autoload_relative :GithubPullRequestLoadError, 'exceptions'
   autoload_relative :HCKClient, 'setupmanagers/hckclient'
   autoload_relative :HCKInstall, 'engines/hckinstall/hckinstall'
   autoload_relative :HCKStudio, 'setupmanagers/hckstudio'

lib/auxiliary/github.rb

@@ -132,7 +132,7 @@ def _find_pr(state = nil)
            Octokit::BadGateway, Octokit::InternalServerError => e
       @logger.warn("Github server connection error: #{e.message}")
       # we should fail if can't get updated PR information
-      raise unless (retries += 1) < GITHUB_API_RETRIES
+      raise GithubPullRequestLoadError, e unless (retries += 1) < GITHUB_API_RETRIES
 
       sleep GITHUB_API_RETRY_SLEEP
       @logger.info('Trying again execute github.pulls')

lib/exceptions.rb

@@ -14,6 +14,8 @@ class AutoHCKInterrupt < Exception; end
   # A custom GithubInitializationError error exception
   class GithubInitializationError < AutoHCKError; end
 
+  class GithubPullRequestLoadError < AutoHCKError; end
+
   # A custom Could not open json file exception
   class OpenJsonError < StandardError; end