fix(setup-flutter): link .fvm/flutter_sdk, export FLUTTER_ROOT and PATH to GITHUB_ENV inside lock

setup-flutter/action.yml

@@ -84,6 +84,22 @@ runs:
           fi
         fi
 
+        mkdir -p .fvm
+        ln -sfn "$SDK_DIR" .fvm/flutter_sdk
+
+        NEW_PATH="$SDK_DIR/bin:$SDK_DIR/bin/cache/dart-sdk/bin:/opt/homebrew/bin:/opt/homebrew/sbin:/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin"
+        export FLUTTER_ROOT="$SDK_DIR"
+        export PATH="$NEW_PATH"
+        echo "FLUTTER_ROOT=$SDK_DIR" >> "$GITHUB_ENV"
+        echo "PATH=$NEW_PATH" >> "$GITHUB_ENV"
+        echo "$SDK_DIR/bin/cache/dart-sdk/bin" >> "$GITHUB_PATH"
+        echo "$SDK_DIR/bin" >> "$GITHUB_PATH"
+
+        if [ "${{ inputs.enable_windowing }}" = "true" ]; then
+          "$SDK_DIR/bin/flutter" config --enable-windowing
+        fi
+        "$SDK_DIR/bin/flutter" --version
+
         rm -rf "$LOCK_DIR" || true
 
     - name: Install Flutter (Windows)
@@ -152,23 +168,6 @@ runs:
           try { [System.IO.Directory]::Delete($lockDir, $true) } catch {}
         }
 
-    - name: Add to PATH and Configure (macOS / Linux)
-      if: runner.os != 'Windows'
-      shell: bash
-      run: |
-        SDK_DIR="$HOME/flutter-sdk"
-        if [ -d "/opt/hostedtoolcache/flutter-sdk" ]; then
-          SDK_DIR="/opt/hostedtoolcache/flutter-sdk"
-        fi
-        export PATH="$SDK_DIR/bin:$SDK_DIR/bin/cache/dart-sdk/bin:$PATH"
-        echo "$SDK_DIR/bin" >> $GITHUB_PATH
-        echo "$SDK_DIR/bin/cache/dart-sdk/bin" >> $GITHUB_PATH
-
-        if [ "${{ inputs.enable_windowing }}" = "true" ]; then
-          "$SDK_DIR/bin/flutter" config --enable-windowing
-        fi
-        "$SDK_DIR/bin/flutter" --version
-
     - name: Add to PATH and Configure (Windows)
       if: runner.os == 'Windows'
       shell: powershell