Fix linux binary build

.github/workflows/release_linux.yml

@@ -11,20 +11,25 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
-    - name: Set up Python
-      uses: actions/setup-python@v2
-      with:
-        python-version: '3.10'
+    - name: Checkout repository
+      uses: actions/checkout@v2
+    - name: Install python
+      run: |
+        sudo apt-get update
+        sudo apt install -y python3.9 python3-pip python3.9-venv \
+          python3.9-dev \
+          python3-pyqt5
     - name: Install dependencies and pyinstall
       run: |
+        python3.9 -m venv build
+        . build/bin/activate
         python -m pip install pip==22.0.4 setuptools==60.10.0
         pip install -r requirements.txt
         pip install PyInstaller==4.10
     - name: Build binary
       run: |
+        . build/bin/activate
         pyinstaller --onefile -n nanovna-saver nanovna-saver.py
-
     - name: Archive production artifacts
       uses: actions/upload-artifact@v1
       with: