feat: add opcc slashing event #59

	# Adapted from https://github.com/marketplace/actions/backporting
	#
	# Usage:
	# - Let's say you want to backport a pull request on a branch named `production`.
	# - Then label it with `backport production`.
	# - That's it! When the pull request gets merged, it will be backported to
	# the `production` branch. If the pull request cannot be backported, a comment
	# explaining why will automatically be posted.
	#
	# Note: multiple backport labels can be added. For example, if a pull request
	# has the labels `backport staging` and `backport production` it will be
	# backported to both branches: `staging` and `production`.
	name: Backport
	on:
	pull_request_target:
	types:
	- closed
	- labeled

	jobs:
	backport:
	name: Backport
	runs-on: ubuntu-latest
	# Only react to merged PRs for security reasons.
	# See https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#pull_request_target.
	if: >
	github.event.pull_request.merged
	&& (
	github.event.action == 'closed'
	\|\| (
	github.event.action == 'labeled'
	&& contains(github.event.label.name, 'backport')
	)
	)
	steps:
	- uses: tibdex/backport@v2
	with:
	github_token: ${{ secrets.GITHUB_TOKEN }}

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