Add install of pyinstaller

.gitlab-ci.yml

@@ -29,6 +29,7 @@ stages:
     - unzip -q conan-${CONAN_VERSION}.zip
     - cd ${CI_PROJECT_DIR}/conan-${CONAN_VERSION}
     - pip install -e .
+    - pip install pyinstaller
     - python pyinstaller.py
     - mv ${CI_PROJECT_DIR}/conan-${CONAN_VERSION}/pyinstaller/dist/conan ${CI_PROJECT_DIR}/${CONAN_ROOT}
     # Add Sectigo CA certificates