this might work better

.github/workflows/node.js.yml

@@ -1,31 +1,39 @@
-# This workflow will do a clean installation of node dependencies, cache/restore them, build the source code and run tests across different versions of node
-# For more information see: https://docs.github.com/en/actions/automating-builds-and-tests/building-and-testing-nodejs
-
-name: Node.js CI
+name: github pages
 
 on:
-  push:
-    branches: [ "main" ]
-  pull_request:
-    branches: [ "main" ]
+    push:
+        branches:
+        - master
 
 jobs:
-  build:
+    deploy:
+        runs-on: ubuntu-18.04
+        steps:
+        - uses: actions/checkout@v2
+
+        - name: Setup Node
+            uses: actions/setup-node@v2-beta
+            with:
+            node-version: '12'
 
-    runs-on: ubuntu-latest
+        - name: Get yarn cache
+            id: yarn-cache
+            run: echo "::set-output name=dir::$(yarn cache dir)"
 
-    strategy:
-      matrix:
-        node-version: [18.x]
-        # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
+        - name: Cache dependencies
+            uses: actions/cache@v2
+            with:
+            path: ${{ steps.yarn-cache.outputs.dir }}
+            key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+            restore-keys: |
+                ${{ runner.os }}-yarn-
+        - run: yarn install --frozen-lockfile
+        - run: yarn build
+            env:
+            REACT_APP_GIT_SHA: ${{ github.SHA }}
 
-    steps:
-    - uses: actions/checkout@v3
-    - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v3
-      with:
-        node-version: ${{ matrix.node-version }}
-        cache: 'npm'
-    - run: npm ci
-    - run: npm run build --if-present
-    - run: npm start
+        - name: Deploy
+            uses: peaceiris/actions-gh-pages@v3
+            with:
+            github_token: ${{ secrets.GITHUB_TOKEN }}
+            publish_dir: ./build

package.json

@@ -5,7 +5,7 @@
   "main": "index.js",
   "scripts": {
     "build": "npm i",
-    "start": "node index.js"
+    "start": "npm start"
   },
   "keywords": [],
   "author": "",