Update github actions workflow to deploy to external repo

Author: adamgraham

.github/workflows/publish.yml

@@ -11,30 +11,33 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
-        with:
-          token: ${{ secrets.REPO_ACCESS }}
+        uses: actions/checkout@v4
 
       - name: Setup
-        uses: actions/setup-node@v2
+        uses: actions/setup-node@v4
         with:
-          node-version: '14'
+          node-version: '20'
+          cache: yarn
+        env:
+          NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
 
-      - name: Install
-        run: npm install
+      - name: Install dependencies
+        run: yarn install --prefer-offline
         env:
           NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
 
       - name: Build
         continue-on-error: false
-        run: npm run-script build
+        run: yarn build
         env:
           NPM_TOKEN: ${{ secrets.NPM_TOKEN }}
 
       - name: Publish
         if: github.event_name == 'push'
-        uses: peaceiris/actions-gh-pages@v3
+        uses: peaceiris/actions-gh-pages@v4
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
+          personal_token: ${{ secrets.PERSONAL_TOKEN }}
+          external_repository: adamgraham/adamgraham.github.io
+          publish_branch: master
           publish_dir: public
-          publish_branch: public