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ci: remove redundant runs on different python versions, unify env init #24

	name: Tests on PR

	on:
	pull_request:
	workflow_dispatch:

	concurrency:
	group: tests-on-pr-${{ github.event.pull_request.number \|\| github.ref }}
	cancel-in-progress: true

	jobs:
	tests-on-pr:
	runs-on: ubuntu-latest
	defaults:
	run:
	shell: bash -l {0}

	steps:
	- name: Check out libdiffpy
	uses: actions/checkout@v6
	with:
	fetch-depth: 0

	- name: Set up C++ tests
	uses: ./.github/actions/setup-tests

	- name: Build and run C++ tests with coverage
	run: \|
	"$CONDA_PREFIX/bin/c++" --version
	scons -j4 build=coverage test

	- name: Generate coverage report
	run: >-
	gcovr --gcov-executable "$CONDA_PREFIX/bin/gcov"
	--root . --filter 'build/coverage-.*/diffpy/'
	--xml coverage.xml

	- name: Upload coverage to Codecov
	uses: codecov/codecov-action@v5
	with:
	files: coverage.xml
	verbose: true
	fail_ci_if_error: true
	token: ${{ secrets.CODECOV_TOKEN }}