add actions/cache support

.github/workflows/workflow.yml

@@ -72,3 +72,22 @@ jobs:
     - name: Run flutter --version
       shell: bash
       run: flutter --version
+  test_with_cache:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+    - uses: actions/cache@v2
+      with:
+        path: ${{ runner.tool_cache }}/flutter
+        key: flutter-2.5.0-stable
+    - uses: ./
+      with:
+        channel: stable
+        flutter-version: 2.5.0
+    - name: Run dart --version
+      shell: bash
+      run: dart --version
+    - name: Run flutter --version
+      shell: bash
+      run: flutter --version

README.md

@@ -146,3 +146,18 @@ jobs:
      - run: flutter build macos
 ```
 
+Integration with actions/cache:
+
+```yaml
+steps:
+- uses: actions/checkout@v2
+- uses: actions/cache@v2
+  with:
+    path: ${{ runner.tool_cache }}/flutter
+    key: flutter-2.5.0-stable
+- uses: subosito/flutter-action@v2
+  with:
+    channel: stable
+    flutter-version: 2.5.0
+- run: flutter --version
+```

setup.sh

@@ -64,6 +64,15 @@ download_archive() {
 CHANNEL="$1"
 VERSION="$2"
 
+if [[ $OS_NAME == windows ]]; then
+  FLUTTER_ROOT="${RUNNER_TOOL_CACHE}\\flutter"
+  PUB_CACHE="${USERPROFILE}\\.pub-cache"
+else
+  FLUTTER_ROOT="${RUNNER_TOOL_CACHE}/flutter"
+  PUB_CACHE="${HOME}/.pub-cache"
+fi
+
+if [[ ! -x "${FLUTTER_ROOT}/bin/flutter" ]]; then
   if [[ $CHANNEL == master ]]; then
     git clone -b master https://github.com/flutter/flutter.git "$RUNNER_TOOL_CACHE/flutter"
   else
@@ -77,13 +86,6 @@ else
     ARCHIVE_PATH=$(echo $VERSION_MANIFEST | jq -r '.archive')
     download_archive "$ARCHIVE_PATH" "$RUNNER_TOOL_CACHE"
   fi
-
-if [[ $OS_NAME == windows ]]; then
-  FLUTTER_ROOT="${RUNNER_TOOL_CACHE}\\flutter"
-  PUB_CACHE="${USERPROFILE}\\.pub-cache"
-else
-  FLUTTER_ROOT="${RUNNER_TOOL_CACHE}/flutter"
-  PUB_CACHE="${HOME}/.pub-cache"
 fi
 
 echo "FLUTTER_ROOT=${FLUTTER_ROOT}" >>$GITHUB_ENV