Jenkins not respecting PATH modification? - docker

Question

I'm struggling to modify the PATH in Jenkins, using various methods to no avail.
I am using Jenkins: 2.319.3
Here is an example where I've tried to use a Dockerfile and powershell. I had comparable results with the bourne shell, where even if the path was exported it would not persist to subsequent shell calls.
When running the dockerfile locally I can confirm that the path is modified correctly, so I feel it must be some Jenkins specific issue?
Dockerfile.unix
ARG VARIANT="bullseye"
ARG PYTHON="3.8"
FROM python:${PYTHON}-${VARIANT}
# Installl powershell
RUN \
DEBIAN_FRONTEND=noninteractive \
&& apt-get update -y \
&& apt-get install -y software-properties-common lsb-release --no-install-recommends \
&& wget "https://packages.microsoft.com/config/debian/$(lsb_release -rs)/packages-microsoft-prod.deb" \
&& dpkg -i packages-microsoft-prod.deb \
&& apt-get update -y \
&& apt-get install -y powershell --no-install-recommends \
&& rm *.deb
RUN \
python3 -m pip install pipx \
&& pipx ensurepath \
&& pipx install tox \
&& pipx install hatch
CMD [ "pwsh" ]
Jenkinsfile
pipeline {
agent {
dockerfile {
filename 'Dockerfile.unix'
reuseNode true
args '-u root'
// Agent label
label 'ubuntu-docker'
}
}
options {
timestamps()
timeout(time: 5, unit: 'MINUTES') // timeout on whole pipeline job
}
stages {
stage('Setup') {
environment {
PATH = "/root/.local/bin:$PATH"
}
steps {
pwsh '$env:PATH' // ------------------------------ not in path
pwsh 'python -m pipx ensurepath'
pwsh '$env:PATH' // ------------------------------ not in path
pwsh 'python -m pipx list'
pwsh '''
$env:PATH="/root/.local/bin:"+$env:PATH
python --version
python -m pip freeze
$env:PATH # ------------------------------------- works
tox --version
hatch --version
'''
}
}
}
}