Gitlab CI runner not taking the environmental variable of the local system - gitlab

Question

I am running a simple hello world python program in gitlab ci. While running it in pipeline it throws the error python not used as the name of a cmdlet.
here is my yml file
workflow:
rules:
- if: $CI_PIPELINE_SOURCE == "push"
when: always
stages:
- Test
- Build
Test_stage:
tags:
- PC_RUNNER
stage: Test
script:
- echo "Test stage started"
- cd .\test\test
- python hello.py
and here is the error
$ cd .\test\test
$ python helloworld.py
python : The naming "python" was not used as the name of a cmdlet, function, script file, or executable
program recognized. Check the spelling of the name, or if the path is correct (if included), and
repeat the process.
In C:\WINDOWS\TEMP\build_script3952941328\script.ps1:235 characters:1
+ python helloworld.py
+~~~
+ CategoryInfo : ObjectNotFound: (python:String) [], CommandNotFoundException
+ FullyQualifiedErrorId : CommandNotFoundException
But when i change the command and give the full path where my python is installed it works
script:
- echo "Test stage started"
- cd .\test\test
- C:\users\abc\python\python.exe hello.py
I have added the environmental paths correctly as i have already double checked it. From the Gitlab documentation i came to know that we can also add environment variable in gitlab runner TOML file which i did as follows
executor = "shell"
shell = "powershell"
environment = ["ENV=C:\users\abc\python\", "LC_ALL=en_US.UTF-8"]
But the gitlab pipeline still throws the above error. Does someone knows what am i doing wrong here? Thanks in advance