Add update notice

Author: benjeffery

.github/workflows/test.yml

@@ -22,10 +22,4 @@ jobs:
           python -m pip install -r requirements.txt
       - name: Build the JupyterLite site
         run: |
-          cp README.md content
-          cd tskit-launcher
-          jlpm install
-          jlpm run build
-          pip install .
-          cd ..
-          jupyter lite build --contents content --output-dir dist
+          ./build.sh

build.sh

@@ -0,0 +1,12 @@
+#!/bin/bash -e
+
+cd tskit-launcher/
+jlpm install
+jlpm run build
+pip install -e . 
+cd ..
+rm -rf dist 
+jupyter lite build --contents content --output-dir dist
+find content/ -type f -exec cat {} \; | sha256sum | cut -d' ' -f1 > content-hash.txt
+HASH=$(cat content-hash.txt)
+echo "{\"contentHash\":\"$HASH\",\"lastUpdated\":\"$(date -u +%Y-%m-%dT%H:%M:%SZ)\"}" > dist/lab/content-config.json

content-hash.txt

@@ -0,0 +1 @@
+05cfda449cc14ff90cee5a0e1f904008f159ce3fd094eb319c55c4fce01076f6