Install cysecuretools in CI

Author: multiplemonomials

.github/workflows/test_building_multiple_executables.yml

@@ -19,6 +19,9 @@ jobs:
           python3 -m pip uninstall -y mbed-tools
           
           python3 -m pip install -e ./tools
+          
+          # Also install cysecuretools which is not installed automatically
+          python3 -m pip install 'cysecuretools~=6.0'
 
       # Note: For this CI job we use MBED_CREATE_PYTHON_VENV=FALSE so that we can make sure
       # this mode works.

tools/cmake/mbed_python_interpreter.cmake

@@ -164,6 +164,8 @@ function(mbed_check_or_install_python_package FOUND_VAR PACKAGE_IMPORT_NAME PACK
                 # Redo the check to confirm it's installed
                 check_python_package(${PACKAGE_IMPORT_NAME} ${FOUND_VAR})
             endif()
+        else()
+            message(WARNING "Mbed: ${PACKAGE_IMPORT_NAME} cannot be installed because the Mbed virtualenv is not being used. Please install ${PACKAGE_INSTALL_CONSTRAINT} into Mbed's Python interpeter manually.")
         endif()
     endif()
 endfunction(mbed_check_or_install_python_package)