Change an error message string to f-string. #1254

	name: PR tests
	on:
	pull_request:
	branches:
	- main
	tags:
	- "*"
	push:
	branches:
	- main
	tags:
	- "*"

	env:
	CONDA: /local/tmp/kbmod-runner/miniconda3

	jobs:
	test-fiducial:
	name: Testing in kbmod_ci env.
	runs-on: self-hosted
	strategy:
	fail-fast: true
	defaults:
	run:
	shell: bash -leo pipefail {0}
	steps:
	- name: Setup environment
	run: echo "/usr/local/cuda-12/bin" > $GITHUB_PATH
	- name: Setup miniconda
	uses: conda-incubator/[email protected]
	with:
	activate-environment: kbmod_ci_clone
	- name: Clone existing environment
	run: \|
	conda deactivate
	conda create --name kbmod_ci_clone --clone kbmod_ci
	conda activate kbmod_ci_clone
	- name: Checkout code
	uses: actions/checkout@v3
	with:
	submodules: recursive
	# Run linters before attempting to compile and install
	# the package, faster fails.
	- name: Linter
	uses: psf/black@stable
	with:
	jupyter: true
	- name: Build KBMOD
	run: \|
	python -m pip install .
	- name: Run tests
	run: \|
	cd tests
	python -m unittest -b
	cd ..

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