Make doxygen generate a spy.tag in the doc files #9

	##======================================================================================================================
	## SPY - Compact C++20 Tuple Toolbox
	## Copyright : SPY Project Contributors
	## SPDX-License-Identifier: BSL-1.0
	##======================================================================================================================
	name: SPY Documentation Generation
	on:
	push:
	branches:
	- main

	jobs:
	generate-doc:
	runs-on: ubuntu-latest
	container:
	image: ghcr.io/jfalcou/compilers:v6
	strategy:
	fail-fast: false
	steps:
	- name: Fetch current branch
	uses: actions/checkout@v4.1.1
	- name: Prepare SPY
	run: \|
	mkdir build && cd build
	cmake .. -G Ninja -DSPY_BUILD_TEST=OFF -DSPY_BUILD_DOCUMENTATION=ON

	- name: Generate Doxygen
	run: \|
	cd build
	ninja spy-doxygen

	- name: Deploy to gh-pages
	uses: peaceiris/actions-gh-pages@v3
	with:
	github_token: ${{ secrets.GITHUB_TOKEN }}
	publish_dir: ./build/doc

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