⚙️ Add actionlint as pre-commit hook and CI workflow

Suppresses false positive on fromJson() matrix php-version property.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: aquarion

.github/workflows/lint-actions.yml

@@ -0,0 +1,22 @@
+name: "[Lint] GitHub Actions"
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - ".github/workflows/**"
+  pull_request:
+    branches: [main]
+    paths:
+      - ".github/workflows/**"
+
+jobs:
+  actionlint:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v6
+      - name: Lint GitHub Actions workflows
+        uses: rhysd/actionlint@v1.7.12
+        with:
+          # fromJson() matrix values have no statically-known type; suppress false positive
+          args: -ignore 'property .php-version. is not defined in object type'

.pre-commit-config.yaml

@@ -0,0 +1,14 @@
+repos:
+  - repo: https://github.com/pre-commit/pre-commit-hooks
+    rev: v3.2.0
+    hooks:
+      - id: trailing-whitespace
+      - id: end-of-file-fixer
+      - id: check-yaml
+      - id: check-added-large-files
+  - repo: https://github.com/rhysd/actionlint
+    rev: v1.7.11
+    hooks:
+      - id: actionlint
+        # fromJson() matrix values have no statically-known type; suppress false positive
+        args: ["-ignore", "property .php-version. is not defined in object type"]