update docs

Author: soulgalore

README.md

@@ -1,8 +1,10 @@
 # Ubuntu + NodeJS base container for sitespeed.io
 
-This is the base Docker container for sitespeed.io containing Ubuntu 22.04 and Node.js 20.x.
+This is the base Docker container for sitespeed.io using latest LTS Ubuntu and NodeJS. The image is built automatically on tag pushes.
+
+Want to built it locally:
 
 ```
-docker buildx build --push --platform linux/arm64,linux/amd64 -t sitespeedio/node:ubuntu-22-04-nodejs-20.9.0 . 
+docker buildx build --push --platform linux/arm64,linux/amd64 -t sitespeedio/node:ubuntu-24-04-nodejs-24.11.0 .
 
 ```