Update release.yml #3

	name: Release on Tag

	on:
	push:
	tags:
	- '*'

	jobs:
	create-release:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout repository
	uses: actions/checkout@v2

	- name: Get the previous tag
	id: prev-tag
	run: echo "::set-output name=prev-tag::$(git describe --tags --abbrev=0 HEAD^1)"

	- name: Get commits since previous tag
	id: commits
	run: echo "::set-output name=commits::$(git log ${{ steps.prev-tag.outputs.prev-tag }}..HEAD --pretty=format:'%h %s')"

	- name: Create Release
	id: create_release
	uses: actions/create-release@v1
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	with:
	tag_name: ${{ github.ref }}
	release_name: ${{ github.ref }}
	body: \|
	${{ steps.commits.outputs.commits }}

	- name: Update CHANGELOG.md
	run: \|
	echo "## ${{ github.ref }} - $(date +'%B %d, %Y')" > new_changelog.md
	echo "${{ steps.commits.outputs.commits }}" >> new_changelog.md
	cat CHANGELOG.md >> new_changelog.md
	mv new_changelog.md CHANGELOG.md
	git config --global user.name 'github-actions[bot]'
	git config --global user.email 'github-actions[bot]@users.noreply.github.com'
	git add CHANGELOG.md
	git commit -m "Update CHANGELOG.md for ${{ github.ref }}"

	- name: Push changes
	run: \|
	git branch update-changelog
	git push origin update-changelog

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