Add fix license header job (#298)

* Add fix license header job

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Ignore unsupported files

* Fix syntax for folder to ignore

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

.github/workflows/fix-license-header.yml

@@ -0,0 +1,52 @@
+name: Fix License Headers
+
+on:
+  pull_request:
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  header-license-fix:
+    runs-on: ubuntu-20.04
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Configure git to use https
+        run: git config --global hub.protocol https
+
+      - name: Checkout the branch from the PR that triggered the job
+        run: hub pr checkout ${{ github.event.pull_request.number }}
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Fix License Header
+        uses: apache/skywalking-eyes/header@v0.4.0
+        with:
+          mode: fix
+
+      - name: Get modified files in the staging directory
+        id: changed-files
+        uses: tj-actions/changed-files@v24
+
+      - name: Apply Changes
+        if: steps.changed-files.outputs.any_changed == 'true'
+        shell: bash -l {0}
+        run: |
+          git config user.name 'github-actions[bot]'
+          git config user.email 'github-actions[bot]@users.noreply.github.com'
+          git add *
+          git commit -m "Automatic application of license header"
+
+      - name: Push fixes
+        if: steps.changed-files.outputs.any_changed == 'true'
+        shell: bash -l {0}
+        run: |
+          git config push.default upstream
+          git push
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.licenserc.yaml

@@ -0,0 +1,22 @@
+header:
+  license:
+    spdx-id: BSD-3-Clause
+    copyright-owner: Jupyter Development Team
+    software-name: JupyterLab
+    content: |
+      Copyright (c) Jupyter Development Team.
+      Distributed under the terms of the Modified BSD License.
+
+  paths-ignore:
+    - "**/*.json"
+    - "**/*.md"
+    - "**/*.po"
+    - "**/*.svg"
+    - "**/*.yml"
+    - "**/*.yaml"
+    - "**/.*"
+    - "**/MANIFEST.in"
+    - "LICENSE"
+    - "jupyterlab_server/test_data"
+
+  comment: on-failure