Enable Notice.txt generation (mattermost#5770)

Signed-off-by: Mustafa Kara <[email protected]>

Co-authored-by: Carrie Warner (Mattermost) <[email protected]>

Author: Mustafa Kara

.config/notice-file/Readme.md

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+# Notice.txt File Configuration
+
+We are automatically generating Notice.txt by using first-level dependencies of the project. The related pipeline uses `config.yaml` stored in this folder.
+
+
+## Pipfile configuration
+For every dependency please add `# Repo: https://github.com/owner/repo` url. Sample:
+
+```
+# Add a "copy" button to code blocks in Sphinx (https://sphinx-copybutton.readthedocs.io/en/latest/)
+# Repo: https://github.com/executablebooks/sphinx-copybutton
+sphinx-copybutton = "0.5.0"
+```
+
+## Configuration
+
+Sample:
+
+```
+title: "Mattermost Documentation Sphinx Extensions"
+copyright: "©2022 Mattermost, Inc.  All Rights Reserved.  See LICENSE.txt for license information."
+description: "This document includes a list of open source components used in Mattermost Documentation Sphinx Extensions, including those that have been modified."
+search:
+  - "Pipfile"
+dependencies: []
+devDependencies: []
+```
+
+| Field | Type   | Purpose |
+| :--   | :--    | :--     |
+| title | string | Field content will be used as a title of the application. See first line of `NOTICE.txt` file. |
+| copyright | string | Field content will be used as a copyright message. See second line of `NOTICE.txt` file. |
+| description | string | Field content will be used as notice file description. See third line of `NOTICE.txt` file. |
+| dependencies | array | If any dependency name mentioned, it will be automatically added even if it is not a first-level dependency. |
+| devDependencies | array | If any dependency name mentioned, it will be added when it is referenced in devDependency section. |
+| search | array | Pipeline will search for Pipfiles files mentioned here. Globstar format is supported ie. `**/Pipfile`. |

.config/notice-file/config.yaml

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+---
+
+title: "Mattermost Documentation Sphinx Extensions"
+copyright: "©2022 Mattermost, Inc.  All Rights Reserved.  See LICENSE.txt for license information."
+description: "This document includes a list of open source components used in Mattermost Documentation Sphinx Extensions, including those that have been modified."
+search:
+  - "Pipfile"
+dependencies: []
+devDependencies: []
+
+...

LICENSE.txt

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+Copyright (c) 2022, Mattermost
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+* Neither the name of the copyright holder nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.