update readme

README.md

@@ -19,21 +19,30 @@ on:
 jobs:
   danger:
     runs-on: ubuntu-latest
+    if: github.event_name  == 'pull_request' # if only run pull request when multiple trigger workflow
     steps:
-      - uses: actions/checkout@v1
-      - uses: actions/setup-ruby@v1
-        with:
-          ruby-version: '2.6'
-      - uses: MeilCli/danger-action@v2
-        with:
-          plugins_file: 'Gemfile'
-          danger_file: 'Dangerfile'
-          danger_id: 'danger-pr'
-        env:
-          DANGER_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    - uses: actions/checkout@v2
+    - uses: actions/setup-ruby@v1
+      with:
+        ruby-version: '2.6'
+    # ↓↓↓ if using bundle cache when danger plugins install ↓↓↓
+    - uses: actions/cache@v1
+      with:
+        path: vendor/bundle
+        key: ${{ runner.os }}-gems-${{ hashFiles('Gemfile') }} # change your gemfile path
+        restore-keys: |
+          ${{ runner.os }}-gems-
+    - name: Bundle config
+      run: bundle config path vendor/bundle
+    # ↑↑↑ if using bundle cache when danger plugins install ↑↑↑
+    - uses: MeilCli/danger-action@v3
+      with:
+        plugins_file: 'Gemfile'
+        danger_file: 'Dangerfile'
+        danger_id: 'danger-pr'
+      env:
+        DANGER_GITHUB_API_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 ```
-- if multiple trigger workflow, use if condition `if: github.event_name  == 'pull_request'`
-  - example is [this repository's workflow](.github/workflows/build.yml)
 
 ## input
 - `danger_version`
@@ -42,13 +51,17 @@ jobs:
   - default: `>= 6.0.0`
 - `plugins_file`
   - optional
-  - gemfile path for danger plugin
+  - gemfile path for danger plugin. if set plugins_file, action do not exec `gem install danger`
 - `danger_file`
   - required
   - dangerfile path for running danger
 - `danger_id`
   - required
   - danger id is an identifier string, example(`danger-pr`, `danger-CI`, etc..)
+- `fail_on_stderr_when_danger`
+  - optional
+  - action fail when danger output stderr
+  - default: `false`
 
 ## env
 - `DANGER_GITHUB_API_TOKEN`