Handle multiline GITHUB_OUTPUT in draft-release GH Action #6

	name: draft-release

	on:
	push:
	tags:
	- v*


	jobs:

	prepare_release:
	runs-on: ubuntu-latest

	steps:

	- name: Checkout this repo sources
	uses: actions/checkout@v3
	with:
	ref: ${{ github.ref_name }}

	- name: Create repo archive
	# Make a static tarball with a checksum that does not change between downloads. This will ease packaging: see #143, #151.
	id: git_archive
	env:
	PROJ_NAME: ${{ github.event.repository.name }}
	REF_NAME: ${{ github.ref_name }}
	EXT: tar.gz
	run: \|
	filename=${PROJ_NAME}-${REF_NAME}.${EXT}
	git archive -o "$filename" "$REF_NAME"
	echo "filename=$filename" >> $GITHUB_OUTPUT

	- name: Get annotated tag's message
	id: tag_msg
	env:
	REF_NAME: ${{ github.ref_name }}
	run: \|
	#git cat-file -p "$REF_NAME" \| tail -n +8
	{
	echo 'msg<<EOF'
	git tag -l "$REF_NAME" --format='%(contents:body)'
	# Returns an empty string for non-annotated (ligthweight) tags.
	echo EOF
	} >> "$GITHUB_OUTPUT"

	- name: Create new release draft
	id: create_release
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	REF_NAME: ${{ github.ref_name }}
	TAG_MSG: ${{ steps.tag_msg.outputs.msg }}
	GIT_ARCHIVE_FILE: ${{ steps.git_archive.outputs.filename }}
	run: \|
	gh release create \
	--draft \
	--verify-tag \
	--notes "$TAG_MSG" \
	--title "$REF_NAME" \
	"$REF_NAME" \
	"$GIT_ARCHIVE_FILE"

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