added powershell lines

.gitea/workflows/flutter-build.yml

@@ -69,6 +69,7 @@ jobs:
           prefix-key: ${{ matrix.job.os }}
 
       - name: Install flutter rust bridge deps
+        shell: powershell
         run: |
           git config --global core.longpaths true
           cargo install flutter_rust_bridge_codegen --version ${{ env.FLUTTER_RUST_BRIDGE_VERSION }} --features "uuid"
@@ -81,6 +82,7 @@ jobs:
 #          git clone https://github.com/Kingtous/rustdesk_thirdpary_lib --depth=1 
           
       - name: Build rustdesk
+        shell: powershell
         env:
           VCPKG_ROOT: C:\rustdesk_thirdpary_lib\vcpkg
         run: python3 .\build.py --portable --hwcodec --flutter --feature IddDriver