Add automated license verification using GitHub Action (#2)

diff --git a/.github/workflows/license.yml b/.github/workflows/license.yml
new file mode 100644
index 0000000..6a0dfe6
--- /dev/null
+++ b/.github/workflows/license.yml
@@ -0,0 +1,36 @@
+# 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.
+
+name: License
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  license:
+    name: license
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+        with:
+          submodules: 'recursive'
+      - name: Check License Header
+        uses: apache/skywalking-eyes/header/@d299844e334855087f18ae1fe3c81ae8d22bc282
+        with:
+          config: .licenserc.yaml
diff --git a/.licenserc.yaml b/.licenserc.yaml
new file mode 100644
index 0000000..7737bc2
--- /dev/null
+++ b/.licenserc.yaml
@@ -0,0 +1,46 @@
+#
+# 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.
+#
+header:
+  license:
+    spdx-id: Apache-2.0
+    copyright-owner: Apache Software Foundation
+
+  paths-ignore:
+    - '.github/ISSUE_TEMPLATE'
+    - '.github/PULL_REQUEST_TEMPLATE'
+    - '**/.gitignore'
+    - '.gitmodules'
+    - '.lift'
+    - 'docker/.env'
+    - 'dist'
+    - 'licenses'
+    - 'dist-material/release-docs'
+    - '**/*.md'
+    - '**/*.json'
+    - '**/*.ftl'
+    - '**/target/**'
+    - '**/*.iml'
+    - '**/*.ini'
+    - '**/*.crt'
+    - '**/*.pem'
+    - '**/*.txt'
+    - 'LICENSE'
+    - 'NOTICE'
+
+  comment: on-failure