feat: use built-in venv, prevent silent failures, avoid pip compatibility issues, and ensure cleanup even if deactivate fails

[immanuwell]

Summary

Improvements in script installer/build-linux.sh

Changes

Changes in installer/build-linux.sh:

• ensure exit on errors, undefined variables, and pipe failures
• use the built-in venv module, removing an external dependency (virtualenv)
• ensure you're using a recent pip version, avoiding potential compatibility issues
• suppresses errors if deactivate fails (which can happen in non-interactive shells)

Testing

I carefully tested this new version of installer/build-linux.sh a few times

Checklist

• Read the contributions page.
• Submitted the CLA form, if you are a first time contributor.
• The introduced changes are covered by unit and/or integration tests.

@ktsakalozos fyi

[Copilot]

Pull request overview

Updates the Linux installer build script to create and use a Python virtual environment via the standard library, enforce stricter shell error handling, and reduce failure modes around environment teardown.

Changes:

• Enable strict bash error handling (set -euo pipefail).
• Switch from virtualenv to python3 -m venv for venv creation.
• Upgrade pip in the venv before installing requirements; make deactivate non-fatal.

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[Copilot]

With set -euo pipefail, any failure in venv creation / dependency install / pyinstaller will exit the script before the teardown lines run, leaving .venv behind. If the intent is to always clean up, add an EXIT/ERR trap that performs deactivate (if defined) and rm -rf .venv, while still propagating the original failure status.

[Copilot]

Switching from virtualenv to python3 -m venv can fail on Debian/Ubuntu images that don’t have the python3-venv (and/or ensurepip) components installed, which would break the build at this step. Consider adding an explicit preflight check with a clear error message (e.g., instructing to install python3-venv) so failures are actionable.

Suggested change

	# Preflight check: ensure that the Python venv module is available.
	if ! python3 -m venv --help >/dev/null 2>&1; then
	echo "Error: Python 'venv' module is not available for python3." >&2
	echo "On Debian/Ubuntu, install it with: sudo apt-get install python3-venv" >&2
	exit 1
	fi