Add actionlint workflow to lint GitHub Actions

Author: ascheman

.github/workflows/actionlint.yml

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+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#       http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+# Lints the GitHub Actions workflows themselves with actionlint
+# (https://github.com/rhysd/actionlint): workflow syntax, expression contexts,
+# and embedded shell (via shellcheck). actionlint is run through
+# github/super-linter (restricted to the GitHub Actions validator) because the
+# ASF org allowed-actions policy permits GitHub-owned actions but not the
+# stand-alone actionlint action/image. Only runs when a workflow file changes.
+name: Actionlint
+
+on:
+  push:
+    paths:
+      - '.github/workflows/**'
+  pull_request:
+    paths:
+      - '.github/workflows/**'
+
+# cancel superseded runs on the same ref (e.g. rapid pushes to a branch)
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+permissions:
+  contents: read
+
+jobs:
+  actionlint:
+    name: Lint GitHub Actions workflows
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout maven
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+
+      # super-linter is GitHub-owned, so it satisfies the ASF allowed-actions
+      # policy (a stand-alone actionlint action/image is not on the allowlist).
+      # VALIDATE_GITHUB_ACTIONS restricts it to actionlint only; other linters
+      # (shellcheck, yaml, ...) can be enabled later via more VALIDATE_* flags.
+      - name: Lint workflows with actionlint (via super-linter)
+        uses: github/super-linter/slim@b807e99ddd37e444d189cfd2c2ca1274d8ae8ef1 # v7
+        env:
+          VALIDATE_ALL_CODEBASE: true
+          VALIDATE_GITHUB_ACTIONS: true
+          DEFAULT_BRANCH: master
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}