add api push key dual to github constraints

[hzxuzhonghu]

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[hzxuzhonghu]

https://github.com/marketplace/actions/fossa-action#push-only-api-token

If you are an open-source project maintainer, you probably want to check pull requests from external contributors with FOSSA, but it's impossible to do with secrets when the workflow runs on the pull request event due to GitHub's constraints. However, FOSSA has the push-only API token, allowing you to safely check pull requests.

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