[bugfix] Fix ReFrame crash when trying to retrieve source code context during errors and treat Unicode errors gracefully #828

	name: ReFrame CI / Scheduler backend tests

	on: [push, pull_request]

	jobs:
	scheduler-test:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	scheduler: ['pbs', 'slurm', 'squeue', 'torque']
	steps:
	- uses: actions/checkout@v4
	- name: Login to GitHub Container Registry
	uses: docker/login-action@v2
	with:
	registry: ghcr.io
	username: ${{ github.actor }}
	password: ${{ secrets.GITHUB_TOKEN }}
	- name: Build Images
	run: \|
	docker compose -f .github/pseudo-cluster/docker-compose.yml build
	- name: Run unit tests with ${{ matrix.scheduler }} scheduler
	run: \|
	BACKEND=${{ matrix.scheduler }} docker compose -f .github/pseudo-cluster/docker-compose.yml up --abort-on-container-exit --exit-code-from unittest-sched
	_exitcode=$?
	docker cp unittest-sched:/home/admin/reframe/coverage.xml .
	exit $_exitcode
	- name: Upload coverage reports
	uses: codecov/[email protected]

Provide feedback