ci: write compile_clang_earliest's apt sources from scratch, in one t… #308

	# C++ unit tests: builds the Catch2 suite under src/tests/ (the archive layer
	# compiled straight into a small test binary -- no python, no pip, no solver
	# deps) and runs it twice: once through ctest, once under valgrind. Being a
	# plain binary makes valgrind practical here (--error-exitcode=1 turns any
	# memory error into a CI failure), which it is not over the python test suite
	# (10-50x slowdown plus CPython suppressions). Complements the Sanitizers
	# workflow, which exercises the full python extension.

	name: C++ unit tests

	on:
	push:
	branches:
	# '*' and not '': a single '*' does not match '/' in GitHub Actions
	# globs, so topic branches like 'foo/bar' would silently never run
	- '**'
	tags:
	- 'v..*'

	jobs:
	cpp_unit_tests:
	name: Catch2 + valgrind
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
	with:
	# eigen (transitive include of the core headers) and Catch2
	submodules: true

	- name: Install valgrind
	run: \|
	sudo apt-get update
	sudo apt-get install -y valgrind

	- name: Configure
	# standalone test project: no python, pybind11 or KLU involved.
	# Debug keeps assert() live and gives valgrind full line info.
	run: cmake -S src/tests -B build_tests -DCMAKE_BUILD_TYPE=Debug

	- name: Build
	run: cmake --build build_tests -j$(nproc)

	- name: Run tests
	run: ctest --test-dir build_tests --output-on-failure

	- name: Run tests under valgrind
	run: \|
	cd build_tests
	valgrind --error-exitcode=1 --leak-check=full --track-origins=yes \
	./lightsim2grid_unit_tests

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