Enabling required commit signing
Repository administrators can enforce required commit signing on a branch to block all commits that are not signed and verified.
Protected branches are available in public repositories with GitHub Free, and in public and private repositories with GitHub Pro, GitHub Team, GitHub Enterprise Cloud, and GitHub Enterprise Server.
Before enabling required commit signing on a branch, you must first set the branch up as a protected branch. For more information, see "Configuring protected branches."
You can automatically enforce protected branch settings for some or all branches in your repository. For more information, see "Configuring protected branches."
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On GitHub Enterprise, navigate to the main page of the repository.
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Under your repository name, click Settings.
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In the left menu, click Branches.
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Under Protected branches, select the branch you want to mark with required commit signing using the drop-down menu.
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Select Require signed commits.
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Optionally, select Include administrators. This enforces the required signed commits on the repository administrators.
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Click Save changes.