Supplement and Improvement for #32558 (#32585)

Thank you for @wxiaoguang's reminders and suggestions:
https://github.com/go-gitea/gitea/pull/32558#discussion_r1849972913

options/locale/locale_en-US.ini

@@ -352,7 +352,7 @@ enable_update_checker = Enable Update Checker
 enable_update_checker_helper = Checks for new version releases periodically by connecting to gitea.io.
 env_config_keys = Environment Configuration
 env_config_keys_prompt = The following environment variables will also be applied to your configuration file:
-config_write_file_prompt = These configuration options will be written into:
+config_write_file_prompt = These configuration options will be written into: %s
 
 [home]
 nav_menu = Navigation Menu

templates/install.tmpl

@@ -338,7 +338,9 @@
 
 					<div class="inline field">
 						<div class="right-content">
-							{{ctx.Locale.Tr "install.config_write_file_prompt"}} <span class="ui label">{{.CustomConfFile}}</span> <button class="btn interact-fg" data-clipboard-text="{{.CustomConfFile}}">{{svg "octicon-copy" 14}}</button>
+							{{$copyBtn := svg "octicon-copy" 14}}
+							{{$filePath := HTMLFormat `<span class="ui label">%s</span> <button class="btn interact-fg" data-clipboard-text="%s">%s</button>` .CustomConfFile .CustomConfFile $copyBtn}}
+							{{ctx.Locale.Tr "install.config_write_file_prompt" $filePath}}
 						</div>
 						<div class="tw-mt-4 tw-mb-2 tw-text-center">
 							<button class="ui primary button">{{ctx.Locale.Tr "install.install_btn_confirm"}}</button>