Add CONTRIBUTING.md #5

	# This file is synced from dry-rb/template-gem repo

	name: sync

	on:
	repository_dispatch:
	push:
	branches:
	- "main"

	jobs:
	main:
	runs-on: ubuntu-latest
	if: (github.event_name == 'repository_dispatch' && github.event.action == 'sync_configs') \|\| github.event_name != 'repository_dispatch'
	env:
	GITHUB_LOGIN: dry-bot
	GITHUB_TOKEN: ${{ secrets.GH_PAT }}
	steps:
	- name: Checkout ${{github.repository}}
	uses: actions/checkout@v3
	- name: Checkout devtools
	uses: actions/checkout@v3
	with:
	repository: dry-rb/devtools
	path: tmp/devtools
	- name: Setup git user
	run: \|
	git config --local user.email "dry-bot@dry-rb.org"
	git config --local user.name "dry-bot"
	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: "3.1"
	- name: Install dependencies
	run: gem install ossy --no-document
	- name: Update changelog.yml from commit
	run: tmp/devtools/bin/update-changelog-from-commit $GITHUB_SHA
	- name: Compile CHANGELOG.md
	run: tmp/devtools/bin/compile-changelog
	- name: Commit
	run: \|
	git add -A
	git commit -m "[devtools] sync" \|\| echo "nothing to commit"
	- name: Push changes
	run: \|
	git pull --rebase origin main
	git push https://dry-bot:${{secrets.GH_PAT}}@github.com/${{github.repository}}.git HEAD:main

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