Setup node for publishing; remove specific version

The versioner will set it from the tag.

.github/workflows/build.yml

@@ -13,6 +13,11 @@ jobs:
       packages: write
     steps:
       - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
+        with:
+          node-version: "20.x"
+          registry-url: 'https://registry.npmjs.org'
+          cache: npm
       - uses: microbit-foundation/npm-package-versioner-action@v1
       - run: npm publish
         if: github.event_name == 'release' && github.event.action == 'created'

package.json

@@ -1,6 +1,6 @@
 {
   "name": "@microbit/smoothie",
-  "version": "1.37.0-microbit.1",
+  "version": "0.0.0",
   "description": "Smoothie Charts: smooooooth JavaScript charts for realtime streaming data",
   "main": "./smoothie.js",
   "types": "./smoothie.d.ts",