show commit ref on home page on netlify

src/components/views/Home.jsx

@@ -9,6 +9,8 @@ import OfflineIndicator from '../OfflineIndicator';
 import packageJson from '../../../package.json'
 import { Tooltip } from 'react-tooltip';
 const {version} = packageJson
+// show commit ref on netlify to know which commit is being served for debugging
+const commitRef = process?.env?.REACT_APP_COMMIT_REF ? ` ${process.env.REACT_APP_COMMIT_REF.slice(0, 7)}` : ''
 
 
 const Home = () => {
@@ -184,7 +186,7 @@ const Home = () => {
           fontSize: "11px",
           marginBottom: "2em",
         }}>
-          plebchan v{version}. GPL-2.0
+          plebchan v{version}{commitRef}. GPL-2.0
         </div>
       </Container>
     </>