install: added option to skip python system packages for setup.sh

setup.sh

@@ -1,8 +1,10 @@
 #!/bin/bash
 
-# install pre-reqs using yum/apt
 PYTHON="${PYTHON:=python3}"
 PYTHON_DEP="${PYTHON_DEP:=python3}"
+
+# install pre-reqs using yum/apt
+if [ -z "${NO_PYTHON}" ]; then
   if command -v apt &> /dev/null
   then
     echo "setup to install CORE using apt"
@@ -16,6 +18,7 @@ else
     echo "install python3, pip, venv, pipx, and invoke to run the automated install"
     exit 1
   fi
+fi
 
 # install tooling for invoke based installation
 ${PYTHON} -m pip install --user pipx==0.16.4