workflows: Add github action workflows to check pull requests.

[Avenger-285714]

Include follow 4 workflows:

• backup-to-gitlab
• chatOps
• check-code
• cla-check

Link: https://github.com/deepin-community/.github

[deepin-ci-robot]

deepin pr auto review

This is a rather large PR, and it would be helpful to have the above diff broken down into smaller, more manageable pieces. For example, the script section could be broken down into tasks that handle different parts of the script (e.g., checking for cap changes, redelivering webhooks, etc.). This would make it easier to review and also make it easier to rebase or undo changes if necessary.

[deepin-ci-robot]

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