Add `nb::is_flag()` annotation to Counter::Flags (#1870) #1982

	name: build-and-test-perfcounters

	on:
	push:
	branches: [ main ]
	pull_request:
	branches: [ main ]

	jobs:
	job:
	# TODO(dominic): Extend this to include compiler and set through env: CC/CXX.
	name: ${{ matrix.os }}.${{ matrix.build_type }}
	runs-on: ${{ matrix.os }}
	strategy:
	fail-fast: false
	matrix:
	os: [ubuntu-22.04, ubuntu-20.04]
	build_type: ['Release', 'Debug']
	steps:
	- uses: actions/checkout@v4

	- name: install libpfm
	run: \|
	sudo apt update
	sudo apt -y install libpfm4-dev

	- name: create build environment
	run: cmake -E make_directory ${{ runner.workspace }}/_build

	- name: configure cmake
	shell: bash
	working-directory: ${{ runner.workspace }}/_build
	run: >
	cmake $GITHUB_WORKSPACE
	-DBENCHMARK_ENABLE_LIBPFM=1
	-DBENCHMARK_DOWNLOAD_DEPENDENCIES=ON
	-DCMAKE_BUILD_TYPE=${{ matrix.build_type }}

	- name: build
	shell: bash
	working-directory: ${{ runner.workspace }}/_build
	run: cmake --build . --config ${{ matrix.build_type }}

	# Skip testing, for now. It seems perf_event_open does not succeed on the
	# hosting machine, very likely a permissions issue.
	# TODO(mtrofin): Enable test.
	# - name: test
	# shell: bash
	# working-directory: ${{ runner.workspace }}/_build
	# run: ctest -C ${{ matrix.build_type }} --rerun-failed --output-on-failure

Provide feedback