v2.0.1 #14

	name: release

	on:
	release:
	types: [published]

	env:
	THIS_RELEASE: ${{ github.event.release.tag_name }}

	jobs:

	# This job updates the major version tag (e.g. "v1") to the published release commit IFF:
	#
	# 1. The release name is in semver format.
	# 2. The release is the "latest" (according to semver), not a patch for an old release.
	#
	# If these criteria are met, then it will update the major version tag to the release commit.
	update_tag:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2

	- name: get latest release
	env:
	GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
	run: \|
	LATEST_RELEASE=$(hub release \| grep -E '^v[0-9]+\.[0-9]+\.[0-9]+$' \| sort -r \| head -n 1)
	echo "latest release: $LATEST_RELEASE"
	echo "LATEST_RELEASE=$LATEST_RELEASE" >> $GITHUB_ENV
	- name: update major tag
	if: env.THIS_RELEASE == env.LATEST_RELEASE
	run: \|
	MAJOR_TAG=$(echo $THIS_RELEASE \| grep -Eo '^v[0-9]+')
	echo "this release ($THIS_RELEASE) is the latest, updating major tag $MAJOR_TAG"

	git config --global user.email "john_brunton@live.co.uk"
	git config --global user.name "John Brunton"
	git tag -fa $MAJOR_TAG -m "Update $MAJOR_TAG tag for release $THIS_RELEASE"
	git push origin $MAJOR_TAG --force

	- name: skip update
	if: env.THIS_RELEASE != env.LATEST_RELEASE
	run: echo "this release ($THIS_RELEASE) is not the latest ($LATEST_RELEASE) (perhaps a patch, or not in semver format?), skipping major tag update"

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