Add CI workflows for PR test coverage enforcement and Nix builds #2

	name: Full Test Suite & Coverage Report

	on:
	pull_request:
	branches:
	- main

	jobs:
	test-coverage:
	name: Tests & Code Coverage
	runs-on: ubuntu-latest
	permissions:
	contents: read

	steps:
	- name: Checkout code
	uses: actions/checkout@v4

	- name: Install Nix
	uses: cachix/install-nix-action@v27
	with:
	nix_path: nixpkgs=channel:nixos-unstable

	# - name: Config Cachix TODO
	# uses: cachix/cachix-action@v15
	# with:
	# name: devenv

	- name: Configure & build project
	run: \|
	nix develop --command bash -c "cmake --build . -j$(nproc)"

	- name: Run tests
	run: \|
	nix develop --command bash -c "cmake --build . --target tests"

	- name: Measure code coverage
	run: \|
	nix develop --command bash -c "cmake --build . --target coverage"

	- name: Export coverage report totals as text
	run: \|
	nix develop --command bash -c "llvm-cov report src/main -instr-profile=coverage.profdata -ignore-filename-regex='test/.*' \| grep TOTAL > coverage.txt && cat coverage.txt"

	# - name: Print coverage report stats
	# run: \|
	# nix develop --command bash -c "cat coverage.txt \| grep 'TOTAL' \| awk '{print \"Functions: \" \$3 \" Lines: \" \$8}' > coverage_summary.txt && cat coverage_summary.txt"

	- name: Verify functions coverage is 100%
	run: \|
	nix develop --command bash -c "cat coverage.txt \| awk '{gsub(/%/, \"\", \$7); if (\$7 == 100) { exit 0 } else { exit 1 }}'"

	- name: Verify line coverage is at least 90%
	run: \|
	nix develop --command bash -c "cat coverage.txt \| awk '{gsub(/%/, \"\", \$10); if (\$10 >= 90) { exit 0 } else { exit 1 }}'"

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