Pass the proxy settings to GitWorktree from GitRepository

This commit also adds a path setting to the proxy url because
without it the url validation was failing in libgit2. It wants
at least a trailing slash.

https://bugzilla.redhat.com/show_bug.cgi?id=1735712

app/models/git_repository.rb

@@ -226,9 +226,16 @@ def worktree_params
         params[:password] = auth.password
       end
     end
+    params[:proxy_url] = proxy_url if Settings.git_repository_proxy.host
     params
   end
 
+  def proxy_url
+    uri_opts = Settings.git_repository_proxy.to_h.slice(:host, :port, :scheme, :path)
+    uri_opts[:path] ||= "/"
+    URI::Generic.build(uri_opts).to_s
+  end
+
   def delete_repo_dir
     FileUtils.rm_rf(directory_name)
   end

config/settings.yml

@@ -840,6 +840,7 @@
   :port:
   :user:
   :scheme:
+  :path:
 :help_menu:
   :documentation:
     :type: default