From 4b4762703735288a538f44c2c9612a6aedcc7459 Mon Sep 17 00:00:00 2001
From: Sviatoslav Sydorenko <wk@sydorenko.org.ua>
Date: Wed, 30 Nov 2022 15:56:14 +0100
Subject: [PATCH] Introduce a centralized GHA check/gate job

This patch is intended to lower the maintenance burden of having to
manually go through each matrix subjob name in the branch protection
repository settings. It allows to only include the check job in the
branch protection and it will robustly determine if the dependencies
have succeeded or not.

It is currently mostly serves the Python ecosystem in projects like
aiohttp, cryptography, open edX, pip etc. But I've also seen other
communities picking it up lately, like the AWS Rust SDK and even the
engine powering https://dev.to, to my surprise. Strictly speaking, it
is agnostic.

Ref: https://github.com/marketplace/actions/alls-green#why
---
 .github/workflows/core.yml | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/.github/workflows/core.yml b/.github/workflows/core.yml
index 6257376a64..6a34d42c07 100644
--- a/.github/workflows/core.yml
+++ b/.github/workflows/core.yml
@@ -45,3 +45,18 @@ jobs:
           commit: true
           url: ${{ secrets.SLACK_BUILD_WEBHOOK }}
           token: ${{ secrets.SLACK_GITHUB_TOKEN }}
+
+  # https://github.com/marketplace/actions/alls-green#why
+  check:  # This job does nothing and is only used for the branch protection
+    if: always()
+
+    needs:
+      - build
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Decide whether the needed jobs succeeded or failed
+        uses: re-actors/alls-green@release/v1
+        with:
+          jobs: ${{ toJSON(needs) }}