GPG Signing

For v3.1 and higher

The default user email for Github Actions is actions@github.com, but GPG signing is not supported when using that email. You can create a service account with a GPG key and use that as the author of your actions.

Fork Sync does not support GPG signing by default. I suggest using the Import GPG action in your worfklow as a pre-sync step.

Sample

steps:
    # Step 1: run a standard checkout action, provided by Github
    - name: Checkout repo
      uses: actions/checkout@v2
      with:
#         fetch-depth: 0
#         ref:  my-branch
        ref:  main
        persist-credentials: false
    
    # Step 2: set up GPG config
    - name: Import GPG key
      uses: crazy-max/ghaction-import-gpg@v4 # or whatever is latest
      with:
        gpg_private_key: ${{ secrets.GPG_KEY }}
        passphrase: ${{ secrets.PASSPHRASE }}
        git_user_signingkey: true    # sets GPG key
        git_commit_gpgsign: true     # sets all commits to use signing (no need to modify sync args)

    # Step 3: run sync action - you know how this goes...
    - name: Pull (Fast-Forward) upstream changes
      uses: aormsby/Fork-Sync-With-Upstream-action@v3.1
      with:
        target_sync_branch: main
        target_repo_token: ${{ secrets.GITHUB_TOKEN }}
        yada
        yada
        yada

Further instructions on setting up the gpg_private_key and passphrase can be found in the Import GPG docs.