Add actionlint

Add a workflow to lint GitHub Actions workflows.

.github/actionlint-matcher.json

@@ -0,0 +1,17 @@
+{
+  "problemMatcher": [
+    {
+      "owner": "actionlint",
+      "pattern": [
+        {
+          "regexp": "^(?:\\x1b\\[\\d+m)?(.+?)(?:\\x1b\\[\\d+m)*:(?:\\x1b\\[\\d+m)*(\\d+)(?:\\x1b\\[\\d+m)*:(?:\\x1b\\[\\d+m)*(\\d+)(?:\\x1b\\[\\d+m)*: (?:\\x1b\\[\\d+m)*(.+?)(?:\\x1b\\[\\d+m)* \\[(.+?)\\]$",
+          "file": 1,
+          "line": 2,
+          "column": 3,
+          "message": 4,
+          "code": 5
+        }
+      ]
+    }
+  ]
+}

.github/workflows/actions-lint.yml

@@ -0,0 +1,36 @@
+name: actions-lint
+
+on:
+  push:
+    branches: [ main ]
+    paths-ignore:
+    - '**/*.gitattributes'
+    - '**/*.gitignore'
+    - '**/*.md'
+  pull_request:
+    branches: [ main ]
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+env:
+  FORCE_COLOR: 3
+  TERM: xterm
+
+jobs:
+  lint:
+    runs-on: ubuntu-latest
+
+    steps:
+
+    - name: Checkout code
+      uses: actions/checkout@f43a0e5ff2bd294095638e18286ca9a3d1956744 # v3.6.0
+
+    - name: Add actionlint problem matcher
+      run: echo "::add-matcher::.github/actionlint-matcher.json"
+
+    - name: Lint workflows
+      uses: docker://rhysd/actionlint@sha256:86ebdb1c0df5a8be92b9d53e2e0c636978a2b3c6e52c86c65a77e2c78a6bd594 # v1.6.25
+      with:
+        args: -color