.github/workflows/ci.yml: add gdc build job #94

	name: PR Info

	# This workflow builds the whole project once and:
	# - comments build deprecations/warnings (highlighting new ones since last tested PR)

	on:
	pull_request:
	branches:
	- master

	jobs:
	pr_info:
	name: PR Info
	runs-on: ubuntu-latest
	steps:
	# we first create a comment thanking the user in pr_info_intro.yml
	# (separate step due to needing GITHUB_TOKEN access)

	# Compiler to test with
	- name: Prepare compiler
	uses: dlang-community/setup-dlang@v1
	with:
	compiler: dmd-latest

	- name: Prepare compiler
	uses: dlang-community/setup-dlang@v1
	with:
	compiler: ldc-latest

	- name: Checkout
	uses: actions/checkout@v3
	with:
	fetch-depth: 0

	- name: Checkout old stuff, with new comment script
	run: \|
	git checkout ${{ github.base_ref }}
	git checkout ${{ github.sha }} -- ./ci/summary_comment.sh ./ci/summary_comment_diff.sh

	# first dump old info

	- name: Check pre-PR status
	run: ./ci/summary_comment.sh \| tee ../OLD_OUTPUT.txt

	- name: Checkout PR target
	run: \|
	git checkout ${{ github.sha }}
	git clean -fd
	git reset --hard

	- name: Evaluate PR
	run: ./ci/summary_comment.sh \| tee ../NEW_OUTPUT.txt

	- name: Generate comment
	run: ./ci/summary_comment_diff.sh ../OLD_OUTPUT.txt ../NEW_OUTPUT.txt \| tee comment.txt

	- name: Prepare comment for upload
	run: \|
	mkdir -p ./pr
	mv comment.txt pr
	echo ${{ github.event.number }} > ./pr/NR

	- name: upload comment to high-trust action making the comment
	uses: actions/upload-artifact@v2
	with:
	name: pr
	path: pr/

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