Refact. build.py, skip portable packing (#7264)

ci and build.py do the packing.

Signed-off-by: fufesou <shuanglongchen@yeah.net>

.github/workflows/flutter-build.yml

@@ -107,7 +107,7 @@ jobs:
         shell: bash
 
       - name: Build rustdesk
-        run: python3 .\build.py --portable --hwcodec --flutter --gpucodec
+        run: python3 .\build.py --portable --hwcodec --flutter --gpucodec --skip-portable-pack
 
       - name: find Runner.res
         # Windows: find Runner.res (compiled from ./flutter/windows/runner/Runner.rc), copy to ./Runner.res
@@ -141,6 +141,7 @@ jobs:
         if: env.UPLOAD_ARTIFACT == 'true'
         run: |
           pushd ./libs/portable
+          pip3 install -r requirements.txt
           python3 ./generate.py -f ../../flutter/build/windows/x64/runner/Release/ -o . -e ../../flutter/build/windows/x64/runner/Release/rustdesk.exe
           popd
           mkdir -p ./SignOutput