Install proto before flatpack when there is internet. Add missing include that caused fail only on Unix

.github/workflows/build_all.yml

@@ -211,6 +211,12 @@ jobs:
         sed -i "/name: OrcaSlicer/{n;s|buildsystem: simple|buildsystem: simple\n    build-options:\n      env:\n        git_commit_hash: \"$git_commit_hash\"|}" \
           scripts/flatpak/com.orcaslicer.OrcaSlicer.yml
       shell: bash
+    - name: Generate config sources
+      run: |
+        python3 -m venv /tmp/codegen_venv
+        /tmp/codegen_venv/bin/pip install grpcio-tools pyyaml -q
+        /tmp/codegen_venv/bin/python tools/run_codegen.py
+      shell: bash
     - uses: flatpak/flatpak-github-actions/flatpak-builder@master
       with:
         bundle: OrcaSlicer-Linux-flatpak_${{ env.ver }}_${{ matrix.variant.arch }}.flatpak