title: Github Actions Flutter CI Error: No version of NDK matched
body: <p><a href="https://github.com/NeoMindStd/HoliNoti" rel="nofollow noreferrer">Project Repository</a></p>
  
  <p>I've been push the <a href="https://github.com/NeoMindStd/HoliNoti/commit/d7322bd679a12364862aec685b9e07de22374e83" rel="nofollow noreferrer">commit</a></p>
  
  <p>but, I got <a href="https://github.com/NeoMindStd/HoliNoti/runs/577484735?check_suite_focus=true" rel="nofollow noreferrer">error</a></p>
  
  <pre><code>* What went wrong:
  Execution failed for task ':app:stripReleaseDebugSymbols'.
  
  
  &gt; No version of NDK matched the requested version 20.0.5594570. Versions available locally: 21.0.6113669
  </code></pre>
  
  <p>Below is the CI code(<a href="https://github.com/NeoMindStd/HoliNoti/blob/master/.github/workflows/flutter-customer.yml" rel="nofollow noreferrer">Flutter CI - Customer</a>):</p>
  
  <pre><code>name: Flutter CI - Customer
  
  on:
    push:
      branches:
        - master
      paths:
        - holinoti_customer/**
        - .github/workflows/flutter-customer.yml
  
    pull_request:
      branches:
        - master
      paths:
        - holinoti_customer/**
  
  jobs:
    build:
  
      runs-on: ubuntu-latest
  
      steps:
      - uses: actions/checkout@v2.0.0
      - name: Set up JDK 11
        uses: actions/setup-java@v1
        with:
          java-version: 11.0.2
      - name: Android NDK toolchain Setup
        uses: ravinderjangra/android-ndk-toolchain-setup@0.1
        with: 
          api: '21'
          arch: 'arm'
          install-location: 'toolchains'
      - uses: subosito/flutter-action@v1.1.1
        with:
          flutter-version: '1.12.x' # you can use 1.12
      - name: Install dependencies
        run: flutter pub get
        working-directory: holinoti_customer
      - name: Test Build
        run: flutter build apk
        working-directory: holinoti_customer
  </code></pre>
  
  <p>In my local project, I set the ndk path in android studio's project structure</p>
  
  <p><a href="https://i.stack.imgur.com/hB1tD.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hB1tD.png" alt=""></a></p>
  
  <p>However, this solution is can't applied on Github Action</p>
  
  <p>So, I tried to use <code>Android NDK toolchain Setup</code>, but still fail</p>