feat: support flutter-version input

.github/workflows/main.yaml

@@ -19,6 +19,8 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: ./
+        with:
+          flutter-version: 3.10.0
       - if: runner.os != 'Windows'
         run: |
           if [[ $(shorebird --version) =~ "Shorebird Engine • revision" ]]; then          
@@ -35,4 +37,4 @@ jobs:
           } else {
             Write-Output "❌ Shorebird CLI is not installed."
             exit 1
-          }
+          }

README.md

@@ -11,10 +11,18 @@ Installs and sets up [Shorebird](https://github.com/shorebirdtech/shorebird) for
 
 ✅ Adds `shorebird` to the system path
 
+✅ Configures the specified version of Flutter
+
 ## Usage
 
 ```yaml
 steps:
   - uses: shorebirdtech/setup-shorebird@v0
   - run: shorebird --version
 ```
+
+## Inputs
+
+The action takes the following inputs:
+
+- `flutter-version`: Which version of Flutter to install alongside Shorebird (e.g. 3.10.6)

action.yml

@@ -5,6 +5,11 @@ branding:
   icon: check-circle
   color: yellow
 
+inputs:
+  flutter-version:
+    description: The Flutter version to use alongside Shorebird
+    required: false
+
 runs:
   using: composite
   steps:
@@ -25,3 +30,7 @@ runs:
         Add-Content $env:GITHUB_PATH "$installDirectory\bin"
         Write-Output "added $installDirectory\bin to GITHUB_PATH"
       shell: pwsh
+    - name: 🐦 Install Flutter
+      if: ${{ inputs.flutter-version }}
+      run: shorebird flutter versions use ${{ inputs.flutter-version }}
+      shell: bash