Replace boost::container::flat_map with a custom flat_map implementat… #543

	name: "test-p4c-ubuntu-18.04"

	on:
	schedule:
	# Every day on midnight UTC
	- cron: "0 0 * * *"
	pull_request:
	branches: [main]
	push:
	branches: [main]

	jobs:
	# Build with GCC and test p4c on Ubuntu 18.04.
	test-ubuntu18:
	# Only run on pull requests with the "run-ubuntu18" label.
	if: ${{ github.event_name == 'schedule' \|\| contains(github.event.pull_request.labels.*.name, 'run-ubuntu18') }}
	runs-on: ubuntu-latest
	env:
	CTEST_PARALLEL_LEVEL: 4
	steps:
	- uses: actions/checkout@v4
	with:
	submodules: recursive
	fetch-depth: 0

	- name: ccache
	uses: hendrikmuhs/ccache-action@v1
	with:
	key: test-ubuntu-18.04-gcc
	max-size: 1000M

	- name: Build (Ubuntu 18.04, GCC)
	run: \|
	docker build -t p4c --build-arg BASE_IMAGE=ubuntu:18.04 --build-arg IMAGE_TYPE=test \
	--build-arg ENABLE_TEST_TOOLS=OFF .
	./tools/export_ccache.sh

	# run with sudo (...) --privileged
	# this is needed to create network namespaces for the ebpf tests.
	- name: Run tests (Ubuntu 18.04)
	run: \|
	sudo -E docker run --privileged -w /p4c/build -e $CTEST_PARALLEL_LEVEL p4c ctest --output-on-failure --schedule-random

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