fix printing environment variables in GitLab CI #305

	# Copyright 2023 Bernhard Manfred Gruber
	# SPDX-License-Identifier: MPL-2.0

	name: Publish amalgamated alpaka.hpp to single-header
	on:
	push:
	branches:
	- develop

	jobs:
	single-header:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: clone single-header
	run: \|
	git clone -b single-header --single-branch https://x-access-token:${{secrets.github_token}}@github.com/${{github.repository}}.git single-header
	- name: create-single-header.sh
	run: \|
	./script/create-single-header.sh
	- name: commit
	run: \|
	set -x
	cd single-header
	if ! git diff --exit-code
	then
	git config --global user.email "action@github.com"
	git config --global user.name "GitHub Action"
	git add include/alpaka/alpaka.hpp
	git commit -m "Update alpaka.hpp"
	git push origin single-header
	else
	echo "No changes to commit"
	fi

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