From 32e6508d2f1cb8c1fe35f36c8eb2b6f570f4e730 Mon Sep 17 00:00:00 2001
From: Matt Godbolt <matt@godbolt.org>
Date: Fri, 10 Jul 2026 16:08:10 -0500
Subject: [PATCH] Lint GitHub Actions workflows with actionlint

Statically checks workflow files (schema, expression contexts,
runner labels, shellcheck over run: scripts) on any PR or push
touching them. .github/actionlint.yaml declares the self-hosted
'admin' label. The existing workflows already pass cleanly.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
---
 .github/actionlint.yaml            |  4 ++++
 .github/workflows/lint-actions.yml | 20 ++++++++++++++++++++
 2 files changed, 24 insertions(+)
 create mode 100644 .github/actionlint.yaml
 create mode 100644 .github/workflows/lint-actions.yml

diff --git a/.github/actionlint.yaml b/.github/actionlint.yaml
new file mode 100644
index 000000000..8bf21eecb
--- /dev/null
+++ b/.github/actionlint.yaml
@@ -0,0 +1,4 @@
+self-hosted-runner:
+  # The admin node is registered as a self-hosted runner (see the infra repository)
+  labels:
+    - admin
diff --git a/.github/workflows/lint-actions.yml b/.github/workflows/lint-actions.yml
new file mode 100644
index 000000000..1b8c9e8df
--- /dev/null
+++ b/.github/workflows/lint-actions.yml
@@ -0,0 +1,20 @@
+name: Lint GitHub Actions workflows
+
+on:
+  push:
+    branches: [main]
+    paths: ['.github/workflows/**', '.github/actionlint.yaml']
+  pull_request:
+    paths: ['.github/workflows/**', '.github/actionlint.yaml']
+
+jobs:
+  actionlint:
+    if: github.repository_owner == 'compiler-explorer'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+      - name: Check workflow files
+        uses: docker://rhysd/actionlint:1.7.12
+        with:
+          args: -color