Add automated database update workflow

- Runs every Tuesday & Friday at 06:00 UTC
- Downloads latest MaxMind GeoLite2-City database
- Auto-bumps version and publishes to npm
- Updates README with last update date

.github/workflows/npm-publish.yml

@@ -1,22 +1,30 @@
-# This workflow will run tests using node and then publish a package to GitHub Packages when a release is created
-# For more information see: https://help.github.com/actions/language-and-framework-guides/publishing-nodejs-packages
+# This workflow publishes to npm when changes are pushed manually
+# Note: The update-database.yml workflow handles automatic updates and publishing
 
-name: Node.js Package
+name: Publish to npm
 
 on:
   push:
     branches:
-    - master
+      - master
+    paths-ignore:
+      - '.github/**'
+      - 'README.md'
+
 jobs:
   publish:
     runs-on: ubuntu-latest
+    # Skip if the commit was made by github-actions (to avoid duplicate publishes)
+    if: github.actor != 'github-actions[bot]'
+
     steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-node@v3
+      - uses: actions/checkout@v4
+
+      - uses: actions/setup-node@v4
         with:
-          node-version: 12
-      - run: npm install
-      - run: npm test
-      - uses: JS-DevTools/npm-publish@v1
-        with:
-          token: ${{ secrets.NPM_TOKEN }}
+          node-version: '20'
+          registry-url: 'https://registry.npmjs.org'
+
+      - run: npm publish
+        env:
+          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}