add auto changelog workflow

.github/workflows/auto-changelog.yml

@@ -0,0 +1,55 @@
+name: ChangeLog
+
+on:
+  workflow_dispatch:
+  release:
+    types: [published]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/setup-node@v2-beta
+      with:
+        node-version: '12'
+    - uses: actions/checkout@v2
+      with:
+        fetch-depth: 0 
+    
+    - name: Checkout Tool
+      uses: actions/checkout@v2
+      with:
+        repository: konakonall/auto-changelog
+        path: 'auto-changelog'
+    - name: Build Tool
+      run: |
+        cd auto-changelog
+        npm install
+        npm link
+        
+    - name: Generate ChangeLog
+      env: # Or as an environment variable
+          TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      run: |
+        auto-changelog --token $TOKEN
+    - name: Cat ChangeLog
+      run: cat CHANGELOG.md
+    
+    - name: Commit files
+      env:
+        CI_USER: "gouki0123"
+        CI_EMAIL: "gouki0123@gmail.com"
+      run: |
+        git config --local user.email "$CI_EMAIL"
+        git config --local user.name "$CI_USER"
+        git add CHANGELOG.md && git commit -m 'Updated CHANGELOG.md' && echo "push=1" >> $GITHUB_ENV || echo "No changes to CHANGELOG.md"
+
+    - name: Push changes
+      if: env.push == 1
+      env:
+        CI_USER: "gouki0123"
+        CI_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      run: |
+        git push "https://$CI_USER:$CI_TOKEN@github.com/$GITHUB_REPOSITORY.git" HEAD:master