fix(GHA): Avoid some actions in forks

[kiblik]

Disable execution of specific GHA in forks.
They would just fail, and it just generates noise.

[dryrunsecurity]

This pull request focuses on enhancing GitHub Actions security by implementing repository-specific restrictions that limit workflow execution, deployment, and notifications to the main repository, thereby preventing unauthorized actions in forked repositories and improving overall access control.

💭 Unconfirmed Findings (4)

Vulnerability	Workflow Repository Restrictions
Description	GitHub Actions workflows were modified to add repository-specific conditions for deployment and notification workflows, ensuring that actions are only executed in the main DefectDojo repository, preventing unauthorized actions in forked repositories.

Vulnerability	Deployment Limitation
Description	Implemented a mechanism to prevent documentation deployment in forked repositories, enhancing security and controlling workflow execution.

Vulnerability	Notification Control
Description	Limited Slack PR reminder notifications to the core repository, reducing unnecessary communication and potential information leakage in forked repositories.

Vulnerability	Access Control Enhancement
Description	Added repository-level access control mechanisms to restrict workflow actions and improve overall security of the GitHub Actions workflows.

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All finding details can be found in the DryRun Security Dashboard.

[mtesauro]

Approved