[feature] add version route

Dockerfile

@@ -11,5 +11,7 @@ RUN npm run-script build
 
 FROM nginx:1.23.2 as runtume
 
+ENV APP_VERSION=latest
+
 COPY ./nginx/templates /etc/nginx/templates
 COPY --from=build /opt/neko/dist /opt/neko/dist

nginx/templates/default.conf.template

@@ -14,4 +14,9 @@ server {
        root   /opt/neko/dist;
        index  index.html;
      }
+
+     location /version {
+        default_type application/json;
+        return 200 '{"version": "$APP_VERSION"}';
+     }
 }