add support for the main channel (#258)

* add support for the main channel

* update testing for the 'main' channel

.github/workflows/workflow.yml

@@ -20,6 +20,9 @@ jobs:
       matrix:
         operating-system: [ubuntu-latest, windows-latest, macos-latest]
         channel: [stable, beta, master]
+        include:
+          - operating-system: ubuntu-latest
+            channel: main
     steps:
     - uses: actions/checkout@v3
     - id: flutter-action

README.md

@@ -23,7 +23,7 @@ steps:
 - uses: actions/checkout@v3
 - uses: subosito/flutter-action@v2
   with:
-    channel: 'stable' # or: 'beta', 'dev' or 'master'
+    channel: 'stable' # or: 'beta', 'dev', 'master' (or 'main')
 - run: flutter --version
 ```
 

setup.sh

@@ -98,7 +98,7 @@ else
 	RELEASE_MANIFEST=$(curl --silent --connect-timeout 15 --retry 5 "$MANIFEST_URL")
 fi
 
-if [[ "$CHANNEL" == "master" ]]; then
+if [[ "$CHANNEL" == "master" || "$CHANNEL" == "main" ]]; then
 	VERSION_MANIFEST="{\"channel\":\"$CHANNEL\",\"version\":\"$VERSION\",\"dart_sdk_arch\":\"$ARCH\",\"hash\":\"$CHANNEL\",\"sha256\":\"$CHANNEL\"}"
 else
 	VERSION_MANIFEST=$(echo "$RELEASE_MANIFEST" | filter_by_channel "$CHANNEL" | filter_by_arch "$ARCH" | filter_by_version "$VERSION")
@@ -157,8 +157,8 @@ if [[ "$PRINT_ONLY" == true ]]; then
 fi
 
 if [[ ! -x "$CACHE_PATH/bin/flutter" ]]; then
-	if [[ "$CHANNEL" == "master" ]]; then
-		git clone -b master https://github.com/flutter/flutter.git "$CACHE_PATH"
+	if [[ "$CHANNEL" == "master" || "$CHANNEL" == "main" ]]; then
+		git clone -b "$CHANNEL" https://github.com/flutter/flutter.git "$CACHE_PATH"
 		if [[ "$VERSION" != "any" ]]; then
 			git config --global --add safe.directory "$CACHE_PATH"
 			(cd "$CACHE_PATH" && git checkout "$VERSION")