configurable path for build script

this is to fix builds on systems where /tmp is mounted with noexec

Author: Valeriy Trubachev

lib/build.rb

@@ -28,7 +28,9 @@ def initialize(data)
     end
 
     def run
-      @run_file = Tempfile.new("executor")
+      FileUtils.mkdir_p(config.jobs_dir) unless File.exists?(config.jobs_dir)
+
+      @run_file = Tempfile.new("executor", config.jobs_dir)
       @run_file.chmod(0700)
 
       @commands.unshift(checkout_cmd)

lib/config.rb

@@ -29,6 +29,10 @@ def builds_dir
       @builds_path ||= File.join($root_path, 'tmp', 'builds')
     end
 
+    def jobs_dir
+      @jobs_path ||= File.join($root_path, 'tmp', 'jobs')
+    end
+
     def write(key, value)
       @config[key] = value