Add CLA and workflow for CLA bot

.github/workflows/cla.yaml

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+name: "CLA Assistant"
+on:
+  issue_comment:
+    types: [created]
+  pull_request_target:
+    types: [opened,closed,synchronize]
+
+permissions:
+  actions: write
+  contents: write
+  pull-requests: write
+  statuses: write
+
+jobs:
+  CLAAssistant:
+    runs-on: ubuntu-latest
+    steps:
+      - name: "CLA Assistant"
+        if: (github.event.comment.body == 'recheck' || github.event.comment.body == 'I have read the CLA Document and I hereby sign the CLA') || github.event_name == 'pull_request_target'
+        uses: contributor-assistant/github-action@v2.3.0
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          path-to-signatures: '.cla-signatures/version1/cla.json'
+          path-to-document: 'https://github.com/pelican-dev/panel/blob/3.x/contributor_license_agreement.md'
+          branch: '3.x'
+          allowlist: dependabot[bot]

contributor_license_agreement.md

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+Thank you for your interest in Pelican ("Pelican Developers"). To clarify the intellectual property license
+granted with Contributions from any person or entity, the Pelican Developers
+must have on file a signed Contributor License Agreement ("CLA")
+from each Contributor, indicating agreement with the license
+terms below. This agreement is for your protection as a Contributor
+as well as the protection of the Pelican Developers and its users. It does not
+change your rights to use your own Contributions for any other purpose.
+
+You accept and agree to the following terms and conditions for Your
+Contributions (present and future) that you submit to the Pelican Developers. In
+return, the Pelican Developers shall not use Your Contributions in a way that
+is contrary to the public benefit or inconsistent with its nonprofit
+status and bylaws in effect at the time of the Contribution. Except
+for the license granted herein to the Pelican Developers and recipients of
+software distributed by the Pelican Developers, You reserve all right, title,
+and interest in and to Your Contributions.
+1. Definitions.
+   "You" (or "Your") shall mean the copyright owner or legal entity
+   authorized by the copyright owner that is making this Agreement
+   with the Pelican Developers. For legal entities, the entity making a
+   Contribution and all other entities that control, are controlled
+   by, or are under common control with that entity are considered to
+   be a single Contributor. For the purposes of this definition,
+   "control" means (i) the power, direct or indirect, to cause the
+   direction or management of such entity, whether by contract or
+   otherwise, or (ii) ownership of fifty percent (50%) or more of the
+   outstanding shares, or (iii) beneficial ownership of such entity.
+   "Contribution" shall mean any original work of authorship,
+   including any modifications or additions to an existing work, that
+   is intentionally submitted by You to the Pelican Developers for inclusion
+   in, or documentation of, any of the products owned or managed by
+   the Pelican Developers (the "Work"). For the purposes of this definition,
+   "submitted" means any form of electronic, verbal, or written
+   communication sent to the Pelican Developers or its representatives,
+   including but not limited to communication on electronic mailing
+   lists, source code control systems, and issue tracking systems that
+   are managed by, or on behalf of, the Pelican Developers for the purpose of
+   discussing and improving the Work, but excluding communication that
+   is conspicuously marked or otherwise designated in writing by You
+   as "Not a Contribution."
+2. Grant of Copyright License. Subject to the terms and conditions of
+   this Agreement, You hereby grant to the Pelican Developers and to
+   recipients of software distributed by the Pelican Developers a perpetual,
+   worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+   copyright license to reproduce, prepare derivative works of,
+   publicly display, publicly perform, sublicense, and distribute Your
+   Contributions and such derivative works.
+3. Grant of Patent License. Subject to the terms and conditions of
+   this Agreement, You hereby grant to the Pelican Developers and to
+   recipients of software distributed by the Pelican Developers a perpetual,
+   worldwide, non-exclusive, no-charge, royalty-free, irrevocable
+   (except as stated in this section) patent license to make, have
+   made, use, offer to sell, sell, import, and otherwise transfer the
+   Work, where such license applies only to those patent claims
+   licensable by You that are necessarily infringed by Your
+   Contribution(s) alone or by combination of Your Contribution(s)
+   with the Work to which such Contribution(s) was submitted. If any
+   entity institutes patent litigation against You or any other entity
+   (including a cross-claim or counterclaim in a lawsuit) alleging
+   that your Contribution, or the Work to which you have contributed,
+   constitutes direct or contributory patent infringement, then any
+   patent licenses granted to that entity under this Agreement for
+   that Contribution or Work shall terminate as of the date such
+   litigation is filed.
+4. You represent that you are legally entitled to grant the above
+   license. If your employer(s) has rights to intellectual property
+   that you create that includes your Contributions, you represent
+   that you have received permission to make Contributions on behalf
+   of that employer, that your employer has waived such rights for
+   your Contributions to the Pelican Developers, or that your employer has
+   executed a separate Corporate CLA with the Pelican Developers.
+5. You represent that each of Your Contributions is Your original
+   creation (see section 7 for submissions on behalf of others). You
+   represent that Your Contribution submissions include complete
+   details of any third-party license or other restriction (including,
+   but not limited to, related patents and trademarks) of which you
+   are personally aware and which are associated with any part of Your
+   Contributions.
+6. You are not expected to provide support for Your Contributions,
+   except to the extent You desire to provide support. You may provide
+   support for free, for a fee, or not at all. Unless required by
+   applicable law or agreed to in writing, You provide Your
+   Contributions on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS
+   OF ANY KIND, either express or implied, including, without
+   limitation, any warranties or conditions of TITLE, NON-
+   INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE.
+7. Should You wish to submit work that is not Your original creation,
+   You may submit it to the Pelican Developers separately from any
+   Contribution, identifying the complete details of its source and of
+   any license or other restriction (including, but not limited to,
+   related patents, trademarks, and license agreements) of which you
+   are personally aware, and conspicuously marking the work as
+   "Submitted on behalf of a third-party: [named here]".
+8. You agree to notify the Pelican Developers of any facts or circumstances of
+   which you become aware that would make these representations
+   inaccurate in any respect.