Reduce action spam when a PR source branch is on YosysHQ/yosys #159

	name: Build and test doc code samples

	on:
	pull_request:
	branches:
	- main

	jobs:
	pre_job:
	runs-on: ubuntu-latest
	outputs:
	should_skip: ${{ steps.skip_check.outputs.should_skip }}
	steps:
	- id: skip_check
	uses: fkirc/skip-duplicate-actions@v5
	with:
	# cancel previous builds if a new commit is pushed
	cancel_others: 'true'
	# only run on push or pull_request, not both
	concurrent_skipping: 'same_content_newer'

	test-docs:
	needs: pre_job
	if: needs.pre_job.outputs.should_skip != 'true'
	runs-on: ubuntu-latest
	steps:
	- name: Install Dependencies
	shell: bash
	run: \|
	sudo apt-get update
	sudo apt-get install gperf build-essential bison flex libreadline-dev gawk tcl-dev libffi-dev git graphviz xdot pkg-config python3 libboost-system-dev libboost-python-dev libboost-filesystem-dev zlib1g-dev

	- name: Setup GCC
	uses: Dup4/actions-setup-gcc@v1

	- name: Runtime environment
	shell: bash
	env:
	WORKSPACE: ${{ github.workspace }}
	run: \|
	echo "GITHUB_WORKSPACE=`pwd`" >> $GITHUB_ENV
	echo "$GITHUB_WORKSPACE/.local/bin" >> $GITHUB_PATH
	echo "procs=$(nproc)" >> $GITHUB_ENV

	- name: Checkout Yosys
	uses: actions/checkout@v3
	with:
	submodules: true
	- name: Build yosys
	shell: bash
	run: \|
	make config-gcc
	make -j${{ env.procs }}

	- name: Run tests
	shell: bash
	run: \|
	make -C docs test -j${{ env.procs }}

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