Fix CI doc-change check to fetch base branch before diffing #139

	name: Generate and Deploy Docs

	on:
	push:
	branches:
	- main
	paths:
	- 'docs/**'
	- 'include/**'

	jobs:
	generate-docs:
	runs-on: ubuntu-latest

	steps:
	- name: Checkout llvm-project
	uses: actions/checkout@v4
	with:
	repository: llvm/llvm-project
	path: llvm-project
	ref: main

	- name: Checkout eld
	uses: actions/checkout@v4
	with:
	path: llvm-project/llvm/tools/eld
	ref: main

	- name: Configure workflow environment variables
	uses: ./llvm-project/llvm/tools/eld/.github/workflows/ConfigureBuildWorkflowENV

	- name: Set up Python
	uses: actions/setup-python@v4
	with:
	python-version: '3.11.4'

	- name: Install dependencies
	run: \|
	sudo apt-get install -y graphviz doxygen libxml2 libxml2-dev libxslt1-dev
	pip install -r llvm-project/llvm/tools/eld/docs/userguide/requirements.txt

	- name: Run CMake
	run: \|
	mkdir obj
	cd obj
	cmake -G Ninja \
	-DCMAKE_BUILD_TYPE=Release \
	-DCMAKE_C_COMPILER:STRING=`which clang` \
	-DCMAKE_CXX_COMPILER:STRING=`which clang++` \
	-DLLVM_TARGETS_TO_BUILD:STRING="ARM;AArch64;RISCV;Hexagon" \
	-DLLVM_ENABLE_SPHINX=On \
	../llvm-project/llvm

	- name: Generate documentation
	run: \|
	cd obj
	ninja eld-docs

	- name: Deploy to docs branch
	run: \|
	ROOT=$(pwd)
	cd llvm-project/llvm/tools/eld
	git config --global user.name 'github-actions'
	git config --global user.email 'github-actions@github.com'
	git checkout --orphan docs
	git rm -rf .
	cp -r ${ROOT}/obj/tools/eld/docs/userguide/html/. .
	touch .nojekyll
	git add .
	git commit -m "Update documentation"
	git push -f origin HEAD:refs/heads/documentation

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