Try staging feature

.github/workflows/deploy_products.yml

@@ -9,6 +9,14 @@ on:
       - 'package.json'
       - 'package-lock.json'
       - '.github/workflows/deploy_products.yml'
+  pull_request:
+    paths:
+      - 'src/**'
+      - 'docs/**'
+      - 'elm.json'
+      - 'package.json'
+      - 'package-lock.json'
+      - '.github/workflows/deploy_products.yml'
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -19,11 +27,23 @@ jobs:
           elm-version: 0.19.1
       - name: install npm dependencies
         run: npm install
+      - name: Get Pull Request Number
+        id: pr
+        run: echo "::set-output name=pull_request_number::$(gh pr view --json number -q .number || echo "")"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      - run: |
+          cp -rf docs "docs/pr-${PULL_REQUEST_NUMBER}"
+          elm make src/Main.elm --output="docs/pr-${PULL_REQUEST_NUMBER}/main.js"
+        if: github.event_name == 'pull_request'
+        with:
+          PULL_REQUEST_NUMBER: ${{ steps.pr.outputs.pull_request_number }}
       - run: elm make src/Main.elm --output=docs/main.js
+        if: github.event_name != 'pull_request'
       - name: git setting
         run: |
-          git config --local user.email "kachick1@gmail.com"
-          git config --local user.name "Kenichi Kamiya"
+          git config --local user.email "kachick1+mobu-elm@gmail.com"
+          git config --local user.name "mobu-elm bot"
       - name: Deploy to GitHub Pages
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}