install pyinstaller in workflow

.github/workflows/build.yml

@@ -72,6 +72,7 @@ jobs:
           python -m pip install https://extras.wxpython.org/wxPython4/extras/linux/gtk3/ubuntu-20.04/wxPython-4.2.1-cp38-cp38-linux_x86_64.whl
 
           python -m pip install -r requirements.txt
+          python -m pip install pyinstaller
 
           # scipy gives us a ELF error when stripped
           sudo apt-get install gcc g++ gfortran python3-dev libopenblas-dev liblapack-dev
@@ -117,6 +118,7 @@ jobs:
           python -m pip install scipy==1.9.0
           pip install wxPython
           python -m pip install -r requirements.txt
+          python -m pip install pyinstaller
 
           echo "${{ env.pythonLocation }}\bin" >> $GITHUB_PATH
       - shell: bash
@@ -164,6 +166,7 @@ jobs:
           python -m pip install wheel
           pip install wxPython
           python -m pip install -r requirements.txt
+          python -m pip install pyinstaller
 
           echo "${{ env.pythonLocation }}\bin" >> $GITHUB_PATH
       - shell: bash
@@ -222,6 +225,7 @@ jobs:
           pip install PyGObject
           pip install wxPython
           pip install -r requirements.txt
+          pip install pyinstaller
 
           echo "${{ env.pythonLocation }}/bin" >> $GITHUB_PATH
       - shell: bash